Ältere Publikationen
| Record 1 of 225 |
| By: Mindarava, Y (Mindarava, Yuliya); Blinder, R (Blinder, Remi); Davydov, VA (Davydov, Valery A.); Zaghrioui, M (Zaghrioui, Mustapha); Agafonov, VN (Agafonov, Viatcheslav N.); Autret, C (Autret, Cecile); Balasubramanian, P (Balasubramanian, Priyadharshini); Brouwer, RG (Brouwer, Raul Gonzalez); Jelezko, F (Jelezko, Fedor) |
| Title: "Core-Shell" Diamond Nanoparticles with NV- Centers and a Highly Isotopically Enriched C-13 Shell as a Promising Hyperpolarization Agent |
| Source: JOURNAL OF PHYSICAL CHEMISTRY C |
| DOI: 10.1021/acs.jpcc.1c08283 |
| Early Access Date: DEC 2021 |
| Abstract: In this article, we demonstrate the synthesis of "core-shell" diamond nanoparticles, possessing nitrogen-vacancy (NV-) centers and naturally abundant C-13 in the inner part (or the "core") and a highly isotopically enriched outer part (or the "shell"). Such nanoparticles are formed by overgrowth over previously electron-irradiated nanodiamonds under high-pressure high-temperature conditions. The synthesized diamond material is investigated using microscopy and spectroscopy techniques. Raman spectroscopy provides an estimate (96%) for the C-13 isotopic content within the "shell", and the persistence of NV-centers in the natural abundance "core", providing an optically detected magnetic resonance signal, is confirmed. Considering the measured nuclear polarization lifetime (T-1 similar to 90 s), the estimation of the spin diffusion length for the "shell" nuclear spins reveals that C-13 can act as a vector for transferring the spin polarization from NV- centers to the surface. These particles, therefore, offer a promising platform for the hyperpolarization of nuclear spins in a fluid. |
| Accession Number: WOS:000731389200001 |
| Record 2 of 225 |
| By: Sakar, B (Sakar, Baha); Liu, Y (Liu, Yan); Sievers, S (Sievers, Sibylle); Neu, V (Neu, Volker); Lang, J (Lang, Johannes); Osterkamp, C (Osterkamp, Christian); Markham, ML (Markham, Matthew L.); Ozturk, O (Ozturk, Osman); Jelezko, F (Jelezko, Fedor); Schumacher, HW (Schumacher, Hans W.) |
| Title: Quantum calibrated magnetic force microscopy |
| Source: PHYSICAL REVIEW B |
| Volume: 104 |
| Issue: 21 |
| Article Number: 214427 |
| DOI: 10.1103/PhysRevB.104.214427 |
| Published: DEC 21 2021 |
| Abstract: We report the quantum calibration of a magnetic force microscope (MFM) by measuring the two-dimensional magnetic stray-field distribution of the MFM tip using a single nitrogen vacancy (NV) center in diamond. From the measured stray-field distribution and the mechanical properties of the cantilever a calibration function is derived allowing to convert MFM images to quantum calibrated stray-field maps. This approach overcomes limitations of priorMFM calibration schemes and allows quantum calibrated nanoscale stray-field measurements in a field range inaccessible to scanning NV magnetometry. Quantum calibrated measurements of a stray-field reference sample allow its use as a transfer standard, opening the road towards fast and easily accessible quantum traceable calibrations of virtually any MFM. |
| Accession Number: WOS:000853232400001 |
| Record 3 of 225 |
| By: Wang, J (Wang, Jing); Han, MZ (Han, Mingzhi); Zhao, SF (Zhao, Shengfang); Cai, YJ (Cai, Yangjian); Jelezko, F (Jelezko, Fedor); Jia, ZM (Jia, Zhengmao); Zeng, QT (Zeng, Qingtian); Peng, YD (Peng, Yandong) |
| Title: Optical PAM-4 generation via electromagnetically induced transparency in nitrogen-vacancy centers |
| Source: RESULTS IN PHYSICS |
| Volume: 30 |
| Article Number: 104802 |
| DOI: 10.1016/j.rinp.2021.104802 |
| Early Access Date: OCT 2021 |
| Published: NOV 2021 |
| Abstract: A scheme of optical four-level pulse amplitude modulation (PAM-4) is proposed based on phase-dependent electromagnetic-induced transparency (EIT) in nitrogen-vacancy (NV) centers. For a closed structure, its transmission depends on the relative phase of applied fields. Based on EIT, the PAM-4 may be achieved by encoding the relative phase and decoding the amplitude of the transmission field. Simulation results show that the differential nonlinearity and the integral nonlinearity of the proposed scheme could be reduced by two orders of magnitude compared with that based on Mach-Zehnder modulator scheme, and the ratio of level separation mismatch is closer to the ideal value 1. Furthermore, the improvement of the system at different probe field detunings and coupling field strengths is investigated. |
| Accession Number: WOS:000720802300012 |
| Record 4 of 225 |
| By: Stuerner, FM (Stuerner, F. M.); Liu, Y (Liu, Y.); Colard, PO (Colard, P. -o.); Markham, M (Markham, M.); Jelezko, F (Jelezko, F.) |
| Title: Magnetometry based on the excited-state lifetimes of a single nitrogen-vacancy center in diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 119 |
| Issue: 13 |
| Article Number: 134001 |
| DOI: 10.1063/5.0070639 |
| Published: SEP 27 2021 |
| Abstract: So far most well-established quantum sensing techniques based on the negatively charged nitrogen-vacancy (NV) center in diamond utilize the recorded fluorescence intensity to detect the electronic spin states. However, the fluorescence intensity of a NV center is not only dependent on its spin state, but also affected by measurement issues, such as fluctuations of the excitation laser power and charge state transformation of the NV center. Instabilities in terms of output power or polarization changes in the laser source as well as sample drifts during a measurement are common factors that weaken the precision. Here, we demonstrate proof-of-principle of a sensing method making use of the excited-state lifetimes of a NV center for magnetometry experiments. |
| Accession Number: WOS:000751392400011 |
| Record 5 of 225 |
| By: Staudenmaier, N (Staudenmaier, Nicolas); Schmitt, S (Schmitt, Simon); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Phase-sensitive quantum spectroscopy with high-frequency resolution |
| Source: PHYSICAL REVIEW A |
| Volume: 104 |
| Issue: 2 |
| Article Number: L020602 |
| DOI: 10.1103/PhysRevA.104.L020602 |
| Published: AUG 30 2021 |
| Abstract: Classical sensors for spectrum analysis are widely used but lack micro- or nanoscale spatial resolution. On the other hand, quantum sensors, capable of working with nanoscale precision, do not provide precise frequency resolution over a wide range of frequencies. Using a single spin in diamond, we present a measurement protocol for quantum probes which enables full signal reconstruction on a nanoscale spatial resolution up to potentially 100 GHz. We achieve 58 nT/root Hz amplitude and 0.095 rad/root Hz phase sensitivity and a relative frequency uncertainty of 10(-12) for a 1.51 GHz signal within 10 s of integration. This technique opens the way to quantum spectrum analysis methods with potential applications in electron spin detection and nanocircuitry in quantum technologies. |
| Accession Number: WOS:000691496400007 |
| Record 6 of 225 |
| By: Chen, LS (Chen, Lisa); Arnold, M (Arnold, Mona); Blinder, R (Blinder, Remi); Jelezko, F (Jelezko, Fedor); Kuehne, AJC (Kuehne, Alexander J. C.) |
| Title: Mixed-halide triphenyl methyl radicals for site-selective functionalization and polymerization |
| Source: RSC ADVANCES |
| Volume: 11 |
| Issue: 44 |
| Pages: 27653-27658 |
| DOI: 10.1039/d1ra04638a |
| Published: AUG 24 2021 |
| Abstract: Derivatives of the stable, luminescent tris-2,4,6-trichlorophenylmethyl (TTM) radical exhibit unique doublet spin properties that are of interest for applications in optoelectronics, spintronics, and energy storage. However, poor reactivity of the chloride-moieties limits the yield of functionalization and thus the accessible variety of high performance luminescent radicals. Here, we present a pathway to obtain mixed-bromide and chloride derivatives of TTM by simple Friedel-Crafts alkylation. The resulting radical compounds show higher stability and site-specific reactivity in cross-coupling reactions, due to the better leaving group character of the para-bromide. The mixed halide radicals give access to complex, and so far inaccessible luminescent open-shell small molecules, as well as polymers carrying the radical centers in their backbone. The new mixed-halide triphenyl methyl radicals represent a powerful building block for customized design and synthesis of stable luminescent radicals. |
| Accession Number: WOS:000686721400055 |
| PubMed ID: 35480635 |
| Record 7 of 225 |
| By: Wu, YK (Wu, Yingke); Alam, MNA (Alam, Md Noor A.); Balasubramanian, P (Balasubramanian, Priyadharshini); Winterwerber, P (Winterwerber, Pia); Ermakova, A (Ermakova, Anna); Muller, M (Mueller, Michael); Wagner, M (Wagner, Manfred); Jelezko, F (Jelezko, Fedor); Raabe, M (Raabe, Marco); Weil, T (Weil, Tanja) |
| Title: Fluorescent Nanodiamond-Nanogels for Nanoscale Sensing and Photodynamic Applications |
| Source: ADVANCED NANOBIOMED RESEARCH |
| Volume: 1 |
| Issue: 7 |
| Article Number: 2000101 |
| DOI: 10.1002/anbr.202000101 |
| Published: JUL 2021 |
| Abstract: Fluorescent nanodiamonds (NDs) are carbon-based nanoparticles with various outstanding magneto-optical properties. After preparation, NDs have a variety of different surface groups that determine their physicochemical properties. For biological applications, surface modifications are crucial to impart a new interface for controlled interactions with biomolecules or cells. Herein, a straightforward synthesis concept denoted "adsorption-crosslinking" is applied for the efficient modification of NDs, which sequentially combines fast noncovalent adsorption based on electrostatic interactions and subsequent covalent crosslinking. As a result, a very thin and uniform nanogel (NG) coating surrounding the NDs is obtained, which imparts reactive groups as well as high colloidal stability. The impact of the reaction time, monomer concentration, molecular weight, structure of the crosslinker on the resulting NG shell, the availability of reactive chemical surface functions, and the quantum sensing properties of the coated NDs are assessed and optimized. Postmodification of the NG-coated NDs is achieved with phototoxic ruthenium complexes yielding ND-based probes suitable for photodynamic applications. The adsorption-crosslinking ND functionalization reported herein provides new avenues toward functional probes and traceable nanocarriers for high-resolution bioimaging, nanoscale sensing, and photodynamic applications. |
| Accession Number: WOS:000782092000005 |
| Record 8 of 225 |
| By: Lenz, T (Lenz, Till); Wickenbrock, A (Wickenbrock, Arne); Jelezko, F (Jelezko, Fedor); Balasubramanian, G (Balasubramanian, Gopalakrishnan); Budker, D (Budker, Dmitry) |
| Title: Magnetic sensing at zero field with a single nitrogen-vacancy center |
| Source: QUANTUM SCIENCE AND TECHNOLOGY |
| Volume: 6 |
| Issue: 3 |
| Article Number: 034006 |
| DOI: 10.1088/2058-9565/abffbd |
| Published: JUL 2021 |
| Abstract: Single nitrogen-vacancy (NV) centers are widely used as nanoscale sensors for magnetic and electric fields, strain and temperature. Nanoscale magnetometry using NV centers allows for example to quantitatively measure local magnetic fields produced by vortices in superconductors, topological spin textures such as skyrmions, as well as to detect nuclear magnetic resonance signals. However, one drawback when used as magnetic field sensor has been that an external bias field is required to perform magnetometry with NV centers. In this work we demonstrate a technique which allows access to a regime where no external bias field is needed. This enables new applications in which this bias field might disturb the system under investigation. Furthermore, we show that our technique is sensitive enough to detect spins outside of the diamond which enables nanoscale zero-to ultralow-field nuclear magnetic resonance. |
| Accession Number: WOS:000665592700001 |
| Record 9 of 225 |
| By: Groot-Berning, K (Groot-Berning, Karin); Jacob, G (Jacob, Georg); Osterkamp, C (Osterkamp, Christian); Jelezko, F (Jelezko, Fedor); Schmidt-Kaler, F (Schmidt-Kaler, Ferdinand) |
| Title: Fabrication of (NV-)-N-15 centers in diamond using a deterministic single ion implanter |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 23 |
| Issue: 6 |
| Article Number: 063067 |
| DOI: 10.1088/1367-2630/ac0753 |
| Published: JUN 2021 |
| Abstract: Nitrogen vacancy (NV) centers in diamond are a platform for several important quantum technologies, including sensing, communication and elementary quantum processors. In this letter we demonstrate the creation of NV centers by implantation using a deterministic single ion source. For this we sympathetically laser-cool single N-15(2)+ molecular ions in a Paul trap and extract them at an energy of 5.9 keV. Subsequently the ions are focused with a lateral resolution of 121(35) nm and are implanted into a diamond substrate without any spatial filtering by apertures or masks. After high-temperature annealing, we detect the NV centers in a confocal microscope and determine a conversion efficiency of about 0.6%. The (NV)-N-15 centers are characterized by optically detected magnetic resonance on the hyperfine transition and coherence time. |
| Accession Number: WOS:000664732300001 |
| Record 10 of 225 |
| By: Xia, XJ (Xia, Xiaojing); Pant, A (Pant, Anupum); Ganas, AS (Ganas, Abbie S.); Jelezko, F (Jelezko, Fedor); Pauzauskie, PJ (Pauzauskie, Peter J.) |
| Title: Quantum Point Defects for Solid-State Laser Refrigeration |
| Source: ADVANCED MATERIALS |
| Volume: 33 |
| Issue: 23 |
| Article Number: 1905406 |
| DOI: 10.1002/adma.201905406 |
| Published: JUN 2021 |
| Abstract: Herein, the role that point defects have played over the last two decades in realizing solid-state laser refrigeration is discussed. A brief introduction to the field of solid-state laser refrigeration is given with an emphasis on the fundamental physical phenomena and quantized electronic transitions that have made solid-state laser-cooling possible. Lanthanide-based point defects, such as trivalent ytterbium ions (Yb3+), have played a central role in the first demonstrations and subsequent development of advanced materials for solid-state laser refrigeration. Significant discussion is devoted to the quantum mechanical description of optical transitions in lanthanide ions, and their influence on laser cooling. Transition-metal point defects have been shown to generate substantial background absorption in ceramic materials, decreasing the overall efficiency of a particular laser refrigeration material. Other potential color centers based on fluoride vacancies with multiple potential charge states are also considered. In conclusion, novel materials for solid-state laser refrigeration, including color centers in diamond that have recently been proposed to realize the solid-state laser refrigeration of semiconducting materials, are discussed. |
| Accession Number: WOS:000658847700025 |
| PubMed ID: 32666603 |
| Record 11 of 225 |
| By: Hoese, M (Hoese, Michael); Koch, MK (Koch, Michael K.); Bharadwaj, V (Bharadwaj, Vibhav); Lang, J (Lang, Johannes); Hadden, JP (Hadden, John P.); Yoshizaki, R (Yoshizaki, Reina); Giakoumaki, AN (Giakoumaki, Argyro N.); Ramponi, R (Ramponi, Roberta); Jelezko, F (Jelezko, Fedor); Eaton, SM (Eaton, Shane M.); Kubanek, A (Kubanek, Alexander) |
| Title: Integrated Magnetometry Platform with Stackable Waveguide-Assisted Detection Channels for Sensing Arrays |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 15 |
| Issue: 5 |
| Article Number: 054059 |
| DOI: 10.1103/PhysRevApplied.15.054059 |
| Published: MAY 26 2021 |
| Abstract: The negatively charged nitrogen vacancy (N-V & minus;) center in diamond has shown great success in nanoscale, high-sensitivity magnetometry. Efficient fluorescence detection is crucial for improving the sensitivity. Furthermore, integrated devices enable practicable sensors. Here, we present an integrated architecture which allows us to create N-V & minus; centers a few nanometers below the diamond surface, and at the same time covering the entire mode field of femtosecond-laser-written type-II waveguides. We experimentally verify the coupling efficiency, showcase the detection of magnetic resonance signals through the waveguides and perform proof-of-principle experiments in magnetic field and temperature sensing. The sensing task can be operated via the waveguide without direct light illumination through the sample, which is important for magnetometry in biological systems that are sensitive to light. In the future, our approach will enable the development of two-dimensional sensing arrays facilitating spatially and temporally correlated magnetometry. |
| Accession Number: WOS:000657702500002 |
| Record 12 of 225 |
| By: Nizovtsev, AP (Nizovtsev, Alexander P.); Pushkarchuk, AL (Pushkarchuk, Aliaksandr L.); Kilin, SY (Kilin, Sergei Ya.); Kargin, NI (Kargin, Nikolai I.); Gusev, AS (Gusev, Alexander S.); Smirnova, MO (Smirnova, Marina O.); Jelezko, F (Jelezko, Fedor) |
| Title: Hyperfine Interactions in the NV-C-13 Quantum Registers in Diamond Grown from the Azaadamantane Seed |
| Source: NANOMATERIALS |
| Volume: 11 |
| Issue: 5 |
| Article Number: 1303 |
| DOI: 10.3390/nano11051303 |
| Published: MAY 2021 |
| Abstract: Nanostructured diamonds hosting optically active paramagnetic color centers (NV, SiV, GeV, etc.) and hyperfine-coupled with them quantum memory C-13 nuclear spins situated in diamond lattice are currently of great interest to implement emerging quantum technologies (quantum information processing, quantum sensing and metrology). Current methods of creation such as electronic-nuclear spin systems are inherently probabilistic with respect to mutual location of color center electronic spin and C-13 nuclear spins. A new bottom-up approach to fabricate such systems is to synthesize first chemically appropriate diamond-like organic molecules containing desired isotopic constituents in definite positions and then use them as a seed for diamond growth to produce macroscopic diamonds, subsequently creating vacancy-related color centers in them. In particular, diamonds incorporating coupled NV-C-13 spin systems (quantum registers) with specific mutual arrangements of NV and C-13 can be obtained from anisotopic azaadamantane molecule. Here we predict the characteristics of hyperfine interactions (hfi) for the NV-C-13 systems in diamonds grown from various isotopically substituted azaadamantane molecules differing in C-13 position in the seed, as well as the orientation of the NV center in the post-obtained diamond. We used the spatial and hfi data simulated earlier for the H-terminated cluster C-510[NV]H--(252). The data obtained can be used to identify (and correlate with the seed used) the specific NV-C-13 spin system by measuring, e.g., the hfi-induced splitting of the m(S) = +/- 1 sublevels of the NV center in optically detected magnetic resonance (ODMR) spectra being characteristic for various NV-C-13 systems. |
| Accession Number: WOS:000657002700001 |
| PubMed ID: 34069205 |
| Record 13 of 225 |
| By: Wu, YK (Wu, Yingke); Alam, MNA (Alam, Md Noor A.); Balasubramanian, P (Balasubramanian, Priyadharshini); Ermakova, A (Ermakova, Anna); Fischer, S (Fischer, Stephan); Barth, H (Barth, Holger); Wagner, M (Wagner, Manfred); Raabe, M (Raabe, Marco); Jelezko, F (Jelezko, Fedor); Weil, T (Weil, Tanja) |
| Title: Nanodiamond Theranostic for Light-Controlled Intracellular Heating and Nanoscale Temperature Sensing |
| Source: NANO LETTERS |
| Volume: 21 |
| Issue: 9 |
| Pages: 3780-3788 |
| DOI: 10.1021/acs.nanolett.1c00043 |
| Early Access Date: APR 2021 |
| Published: MAY 12 2021 |
| Abstract: Temperature is an essential parameter in all biological systems, but information about the actual temperature in living cells is limited. Especially, in photothermal therapy, local intracellular temperature changes induce cell death but the local temperature gradients are not known. Highly sensitive nanothermometers would be required to measure and report local temperature changes independent of the intracellular environment, including pH or ions. Fluorescent nanodiamonds (ND) enable temperature sensing at the nanoscale independent of external conditions. Herein, we prepare ND nanothermometers coated with a nanogel shell and the photothermal agent indocyanine green serves as a heat generator and sensor. Upon irradiation, programmed cell death was induced in cancer cells with high spatial control. In parallel, the increase in local temperature was recorded by the ND nanothermometers. This approach represents a great step forward to record local temperature changes in different cellular environments inside cells and correlate these with thermal biology. |
| Accession Number: WOS:000651773600010 |
| PubMed ID: 33881327 |
| Record 14 of 225 |
| By: Joas, T (Joas, Timo); Schmitt, S (Schmitt, Simon); Santagati, R (Santagati, Raffaele); Gentile, AA (Gentile, Antonio Andrea); Bonato, C (Bonato, Cristian); Laing, A (Laing, Anthony); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Online adaptive quantum characterization of a nuclear spin |
| Source: NPJ QUANTUM INFORMATION |
| Volume: 7 |
| Issue: 1 |
| Article Number: 56 |
| DOI: 10.1038/s41534-021-00389-z |
| Published: APR 8 2021 |
| Abstract: The characterization of quantum systems is both a theoretical and technical challenge. Theoretical because of the exponentially increasing complexity with system size and the fragility of quantum states under observation. Technical because of the requirement to manipulate and read out individual atomic or photonic elements. Adaptive methods can help to overcome these challenges by optimizing the amount of information each measurement provides and reducing the necessary resources. Their implementation, however, requires fast-feedback and complex processing algorithms. Here, we implement online adaptive sensing with single spins and demonstrate close to photon shot noise limited performance with high repetition rate, including experimental overheads. We further use fast feedback to determine the hyperfine coupling of a nuclear spin to the nitrogen-vacancy sensor with a sensitivity of 445-1. Our experiment is a proof of concept that online adaptive techniques can be a versatile tool to enable faster characterization of the spin environment. |
| Accession Number: WOS:000639794600001 |
| Record 15 of 225 |
| By: Schmitt, S (Schmitt, Simon); Gefen, T (Gefen, Tuvia); Louzon, D (Louzon, Daniel); Osterkamp, C (Osterkamp, Christian); Staudenmaier, N (Staudenmaier, Nicolas); Lang, JN (Lang, Johannes); Markham, M (Markham, Matthew); Retzker, A (Retzker, Alex); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Optimal frequency measurements with quantum probes |
| Source: NPJ QUANTUM INFORMATION |
| Volume: 7 |
| Issue: 1 |
| Article Number: 55 |
| DOI: 10.1038/s41534-021-00391-5 |
| Published: APR 1 2021 |
| Abstract: Precise frequency measurements are important in applications ranging from navigation and imaging to computation and communication. Here we outline the optimal quantum strategies for frequency discrimination and estimation in the context of quantum spectroscopy, and we compare the effectiveness of different readout strategies. Using a single NV center in diamond, we implement the optimal frequency discrimination protocol to discriminate two frequencies separated by 2 kHz with a single 44 mu s measurement, a factor of ten below the Fourier limit. For frequency estimation, we achieve a frequency sensitivity of 1.6 mu Hz/Hz(2) for a 1.7 mu T amplitude signal, which is within a factor of 2 from the quantum limit. Our results are foundational for discrimination and estimation problems in nanoscale nuclear magnetic resonance spectroscopy. |
| Accession Number: WOS:000636732600002 |
| Record 16 of 225 |
| By: Sturner, FM (Stuerner, Felix M.); Brenneis, A (Brenneis, Andreas); Buck, T (Buck, Thomas); Kassel, J (Kassel, Julian); Rolver, R (Roelver, Robert); Fuchs, T (Fuchs, Tino); Savitsky, A (Savitsky, Anton); Suter, D (Suter, Dieter); Grimmel, J (Grimmel, Jens); Hengesbach, S (Hengesbach, Stefan); Fortsch, M (Foertsch, Michael); Nakamura, K (Nakamura, Kazuo); Sumiya, H (Sumiya, Hitoshi); Onoda, S (Onoda, Shinobu); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor) |
| Title: Integrated and Portable Magnetometer Based on Nitrogen-Vacancy Ensembles in Diamond |
| Source: ADVANCED QUANTUM TECHNOLOGIES |
| Volume: 4 |
| Issue: 4 |
| Article Number: 2000111 |
| DOI: 10.1002/qute.202000111 |
| Early Access Date: FEB 2021 |
| Published: APR 2021 |
| Abstract: Magnetic field sensors that exploit quantum effects have shown that they can outperform classical sensors in terms of sensitivity enabling a range of novel applications in future, such as a brain machine interface. Negatively charged nitrogen-vacancy (NV) centers in diamond have emerged as a promising high sensitivity platform for measuring magnetic fields at room temperature. Transferring this technology from laboratory setups into products and applications, the total size of the sensor, the overall power consumption, and the costs need to be reduced and optimized. Here, a fiber-based NV magnetometer featuring a complete integration of all functional components is demonstrated without using any bulky laboratory equipment. This integrated prototype allows portable measurement of magnetic fields with a sensitivity of 344( )pT( )Hz(-1/2). |
| Accession Number: WOS:000616652100001 |
| Record 17 of 225 |
| By: Kitaizumi, T (Kitaizumi, Takahiro); Kuwahata, A (Kuwahata, Akihiro); Saichi, K (Saichi, Kota); Sato, T (Sato, Takumi); Igarashi, R (Igarashi, Ryuji); Ohshima, T (Ohshima, Takeshi); Masuyama, Y (Masuyama, Yuta); Iwasaki, T (Iwasaki, Takayuki); Hatano, M (Hatano, Mutsuko); Jelezko, F (Jelezko, Fedor); Kusakabe, M (Kusakabe, Moriaki); Yatsui, T (Yatsui, Takashi); Sekino, M (Sekino, Masaki) |
| Title: Magnetic Field Generation System of the Magnetic Probe With Diamond Quantum Sensor and Ferromagnetic Materials for the Detection of Sentinel Lymph Nodes With Magnetic Nanoparticles |
| Source: IEEE TRANSACTIONS ON MAGNETICS |
| Volume: 57 |
| Issue: 2 |
| Article Number: 5100405 |
| DOI: 10.1109/TMAG.2020.3009334 |
| Published: FEB 2021 |
| Abstract: We have developed the magnetic probe with a diamond quantum sensor and electromagnetic coils to detect sentinel lymph nodes (SLNs), as the medical application of diamond quantum sensing. The probe magnetizes magnetic nanoparticles (MNPs) accumulated in SLNs and detect the magnetic fields of magnetized MNPs. In this study, we designed a ferromagnetic core that has a unique shape and optimized the magnetic field generation system for improving the detection performance such as the magnetic sensitivity and detectable distance. The proposed magnetic core enhances an excitation magnetic field strength at a longer distance and suppresses a bias field strength at a location of the diamond quantum sensor. The increment of the excitation field is approximately 370% and the decrement of the bias field is approximately 45%. In addition to the proposed magnetic core, even applying a cancellation coil, the excitation field strength is tenfold compared with the coil only structure, suggesting the larger magnetization of MNPs generates the large magnetic field for longer detectable distance. |
| Accession Number: WOS:000611096900031 |
| Record 18 of 225 |
| By: Gieysztor, M (Gieysztor, Maria); Misiaszek, M (Misiaszek, Marta); van der Veen, J (van der Veen, Joscelyn); Gawlik, W (Gawlik, Wojciech); Jelezko, F (Jelezko, Fedor); Kolenderski, P (Kolenderski, Piotr) |
| Title: Interaction of a heralded single photon with nitrogen-vacancy centers in a diamond |
| Source: OPTICS EXPRESS |
| Volume: 29 |
| Issue: 2 |
| Pages: 564-570 |
| DOI: 10.1364/OE.409882 |
| Published: JAN 18 2021 |
| Abstract: A simple, room-temperature, cavity- and vacuum-free interface for a photon-matter interaction is implemented. In the experiment, a heralded single photon generated by the process of spontaneous parametric down-conversion is absorbed by an ensemble of nitrogen-vacancy color centers. The broad absorption spectrum associated with the phonon sideband solves the mismatch problem of a narrow absorption bandwidth in a typical atomic medium and broadband spectrum of quantum light. The heralded single photon source is tunable in the spectral range 452 - 575 nm, which overlaps well with the absorption spectrum of nitrogen-vacancy centers. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement |
| Accession Number: WOS:000609227300060 |
| PubMed ID: 33726289 |
| Record 19 of 225 |
| By: Anders, J (Anders, Jens); Dreyer, F (Dreyer, Frederik); Kruger, D (Krueger, Daniel); Schwartz, I (Schwartz, Ilai); Plenio, MB (Plenio, Martin B.); Jelezko, F (Jelezko, Fedor) |
| Title: Progress in miniaturization and low-field nuclear magnetic resonance |
| Source: JOURNAL OF MAGNETIC RESONANCE |
| Volume: 322 |
| Article Number: 106860 |
| DOI: 10.1016/j.jmr.2020.106860 |
| Early Access Date: JAN 2021 |
| Published: JAN 2021 |
| Abstract: In this paper, we review the latest developments in miniaturization of NMR systems with an emphasis on low-field NMR. We briefly cover the topics of magnet and coil miniaturization, elaborating on the advantages and disadvantages of miniaturized coils for different applications. The main part of the article is dedicated to progress in NMR electronics. Here, we touch upon software-defined radios as an emerging gadget for NMR before we provide a detailed discussion of NMR-on-a-chip transceivers as the ultimate solution in terms of miniaturization of NMR electronics. In addition to discussing the miniaturization capabilities of the NMR-on-a-chip approach, we also investigate the potential use of NMR-on-a-chip devices for an improved NMR system performance. Here, we also discuss the possibility of combining the NMR-on-a-chip approach with EPR-on-a-chip spectrometers to form compact DNP-on-a-chip systems that can provide a significant sensitivity boost, especially for low-field NMR systems. (C) 2020 Published by Elsevier Inc. |
| Accession Number: WOS:000608261400007 |
| PubMed ID: 33423757 |
| Record 20 of 225 |
| By: Pushkarchuk, AL (Pushkarchuk, A. L.); Kuten, SA (Kuten, S. A.); Kilin, SY (Kilin, S. Ya.); Nizovtsev, AP (Nizovtsev, A. P.); Pushkarchuk, VA (Pushkarchuk, V. A.); Michels, DL (Michels, D. L.); Lyakhov, D (Lyakhov, D.); Jelezko, F (Jelezko, F.) |
| Title: Influence of Structural, Electronic and Spin Properties of ND[NV] - Surface Group Conjugates on Formation of Their Biological Activity: Quantum Chemical Simulations |
| Source: NONLINEAR PHENOMENA IN COMPLEX SYSTEMS |
| Volume: 24 |
| Issue: 4 |
| Pages: 348-355 |
| DOI: 10.33581/1561-4085-2021-24-3-348-355 |
| Published: 2021 |
| Abstract: To estimate possible biological activity of conjugates based on nanodiamond with an NV center inside (ND[NV]), with various functional groups located on its surface, their structural, electronic, and spin properties were calculated using the PM6 method. The energy gap between HOMO and LUMO of the complex was used as a main indicator of biological activity. It has been shown that complexes with OH or H groups attached to the (111) surface are most stable in an aqueous medium. Analysis of spin density and HOMO and LUMO localization shows that complexes ND[NV] may be not just an inert carrier of a biologically active drug or means of visualizing drug delivery, but are also directly involved in the formation of the biological activity of the conjugate. |
| Accession Number: WOS:000753956900006 |
| Record 21 of 225 |
| By: Bourgeois, E (Bourgeois, Emilie); Gulka, M (Gulka, Michal); Wirtitsch, D (Wirtitsch, Daniel); Siyushev, P (Siyushev, Petr); Zheng, HJ (Zheng, Huijie); Hruby, J (Hruby, Jaroslav); Wickenbrock, A (Wickenbrock, Arne); Budker, D (Budker, Dmitry); Gali, A (Gali, Adam); Trupke, M (Trupke, Michael); Jelezko, F (Jelezko, Fedor); Nesladek, M (Nesladek, Milos) |
| Edited by: Nebel, CE (Nebel, CE); Aharonovich I (Aharonovich, I); Mizuochi, N (Mizuochi, N); Hatano, M (Hatano, M) |
| Title: Fundaments of photoelectric readout of spin states in diamond |
| Source: DIAMOND FOR QUANTUM APPLICATIONS, PT 2 |
| Book Series Title: Semiconductors and Semimetals |
| Volume: 104 |
| Pages: 105-147 |
| DOI: 10.1016/bs.semsem.2020.08.001 |
| Published: 2021 |
| Accession Number: WOS:000750870400004 |
| Record 22 of 225 |
| By: Findler, C (Findler, Christoph); Lang, J (Lang, Johannes); Osterkamp, C (Osterkamp, Christian); Nesladek, M (Nesladek, Milos); Jelezko, F (Jelezko, Fedor) |
| Title: Indirect overgrowth as a synthesis route for superior diamond nano sensors |
| Source: SCIENTIFIC REPORTS |
| Volume: 10 |
| Issue: 1 |
| Article Number: 22404 |
| DOI: 10.1038/s41598-020-79943-2 |
| Published: DEC 29 2020 |
| Abstract: The negatively charged nitrogen-vacancy (NV-) center shows excellent spin properties and sensing capabilities on the nanoscale even at room temperature. Shallow implanted NV- centers can effectively be protected from surface noise by chemical vapor deposition (CVD) diamond overgrowth, i.e. burying them homogeneously deeper in the crystal. However, the origin of the substantial losses in NV- centers after overgrowth remains an open question. Here, we use shallow NV- centers to exclude surface etching and identify the passivation reaction of NV to NVH centers during the growth as the most likely reason. Indirect overgrowth featuring low energy (2.5-5 keV) nitrogen ion implantation and CVD diamond growth before the essential annealing step reduces this passivation phenomenon significantly. Furthermore, we find higher nitrogen doses to slow down the NV-NVH conversion kinetics, which gives insight into the sub-surface diffusion of hydrogen in diamond during growth. Finally, nano sensors fabricated by indirect overgrowth combine tremendously enhanced T2 and T2 times with an outstanding degree of depth-confinement which is not possible by implanting with higher energies alone. Our results improve the understanding of CVD diamond overgrowth and pave the way towards reliable and advanced engineering of shallow NV- centers for future quantum sensing devices. |
| Accession Number: WOS:000605534200002 |
| PubMed ID: 33376240 |
| Record 23 of 225 |
| By: Zimmermann, J (Zimmermann, Jonatan); London, P (London, Paz); Yirmiyahu, Y (Yirmiyahu, Yaniv); Jelezko, F (Jelezko, Fedor); Blank, A (Blank, Aharon); Gershoni, D (Gershoni, David) |
| Title: Selective noise resistant gate |
| Source: PHYSICAL REVIEW B |
| Volume: 102 |
| Issue: 24 |
| Article Number: 245408 |
| DOI: 10.1103/PhysRevB.102.245408 |
| Published: DEC 7 2020 |
| Abstract: Realizing individual control on single qubits in a spin-based quantum register is an ever-increasing challenge due to the close proximity of the qubits' resonance frequencies. Current schemes typically suffer from an inherent trade-off between fidelity and qubits selectivity. Here, we report on a scheme which combines noise protection by dynamical decoupling and magnetic gradient based selectivity, to enhance both the fidelity and the selectivity. With a single nitrogen-vacancy center in diamond, we experimentally demonstrate quantum gates with fidelity = 0.9 +/- 0.02 and a 50 - kHz spectral bandwidth, which is almost an order of magnitude narrower than the unprotected bandwidth. Our scheme will enable selective control of an individual nitrogen-vacancy qubit in an interacting qubits array using relatively moderate gradients of about 1 mG/nm. |
| Accession Number: WOS:000596083800007 |
| Record 24 of 225 |
| By: Sarikavak-Lisesivdin, B (Sarikavak-Lisesivdin, B.); Lisesivdin, SB (Lisesivdin, S. B.); Ozbay, E (Ozbay, E.); Jelezko, F (Jelezko, F.) |
| Title: Structural parameters and electronic properties of 2D carbon allotrope: Graphene with a kagome lattice structure |
| Source: CHEMICAL PHYSICS LETTERS |
| Volume: 760 |
| Article Number: 138006 |
| DOI: 10.1016/j.cplett.2020.138006 |
| Published: DEC 2020 |
| Abstract: In this paper, the electronic properties of a carbon allotrope, graphene with a kagome lattice structure, are investigated. Spin-polarized density functional theory (DFT) calculations with Grimme dispersion corrections were done. Bond lengths, electronic band structure, and projected density of states were calculated. Electronic band structure calculations show kagome flat-band formation with higher d-orbital contributed bonding behavior than the pristine graphene structure. The structural parameters and electronic band results of this 2D carbon allotrope show wider possible usage in many applications from desalination membranes to possible high temperature superconductors. |
| Accession Number: WOS:000596603000010 |
| PubMed ID: 32958962 |
| Record 25 of 225 |
| By: Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Pushkarchuk, AL (Pushkarchuk, A. L.); Kuten, SA (Kuten, S. A.); Poklonski, NA (Poklonski, N. A.); Michels, D (Michels, D.); Lyakhov, D (Lyakhov, D.); Jelezko, F (Jelezko, F.) |
| Title: Spatial and Hyperfine Characteristics of SiV- and SiV0 Color Centers in Diamond: DFT Simulation |
| Source: SEMICONDUCTORS |
| Volume: 54 |
| Issue: 12 |
| Pages: 1685-1688 |
| DOI: 10.1134/S1063782620120271 |
| Published: DEC 2020 |
| Abstract: One of the most promising platforms to implement quantum technologies are coupled electron-nuclear spins in diamond in which the electrons of paramagnetic color centers play a role of "fast" qubits, while nuclear spins of nearby C-13 atoms can store quantum information for a very long time due to their exceptionally high isolation from the environment. Essential prerequisite for a high-fidelity spin manipulation in these systems with tailored control pulse sequences is a complete knowledge of hyperfine interactions. Development of this understanding for the negatively charged "silicon-vacancy" (SiV-) and neutral (SiV0) color center, is a primary goal of this article, where we are presenting shortly our recent results of computer simulation of spatial and hyperfine characteristics of these SiV centers in H-terminated cluster C-128[SiV]H-98 along with their comparison with available experimental data. |
| Accession Number: WOS:000596090700026 |
| Record 26 of 225 |
| By: Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Pushkarchuk, AL (Pushkarchuk, A. L.); Kuten, SA (Kuten, S. A.); Gusev, AS (Gusev, A. S.); Jelezko, F (Jelezko, F.) |
| Title: Hyperfine Characteristics of Quantum Registers NV-C-13 in Diamond Nanocrystals Formed by Seeding Approach from Isotopic Aza-Adamantane and Methyl-Aza-Adamanthane |
| Source: SEMICONDUCTORS |
| Volume: 54 |
| Issue: 12 |
| Pages: 1689-1691 |
| DOI: 10.1134/S1063782620120283 |
| Published: DEC 2020 |
| Abstract: We predict the characteristics of hyperfine interactions (hfi) for a number of electron-nuclear spin systems NV-C-13 in diamonds grown by seeding approach from the specific isotopic aza-adamantane or methyl-aza-adamantane molecules differing in C-13 position in the precursor as well as in the orientation of the NV center in the post-obtained diamond. For the purpose we have used the spatial and hfi data simulated previously for the cluster C-510[NV]H--(252). The data obtained can be used to identify (and correlate with the precursor used) the specific NV-C-13 spin system by measuring the hfi-induced splitting in optically detected magnetic resonance spectra being characteristic for the NV-C-13 system. |
| Accession Number: WOS:000596090700027 |
| Record 27 of 225 |
| By: Pushkarchuk, AL (Pushkarchuk, A. L.); Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Kuten, SA (Kuten, S. A.); Pushkarchuk, VA (Pushkarchuk, V. A.); Michels, D (Michels, D.); Lyakhov, D (Lyakhov, D.); Jelezko, F (Jelezko, F.) |
| Title: DFT Simulation of Electronic and Spin Properties of GeV- Color Center in Volume and Near-Surface of Nanodiamond for Temperature Sensor Applications |
| Source: SEMICONDUCTORS |
| Volume: 54 |
| Issue: 12 |
| Pages: 1725-1727 |
| DOI: 10.1134/S1063782620120325 |
| Published: DEC 2020 |
| Abstract: The "germanium-vacancy" (GeV) center in diamond can be used as Temperature Sensors. The idea of GeV-based thermometry is based on optical measurements of the spectral shift of the zero-phonon line and its spectral width as a function of temperature changes. At the same time optical characteristics of GeV center which is located near-surface could be modified by formation of defect states in the band gap based on surface impurities and dangling bonds. The electronic structure of the GeV center determines its optical properties. The goal of this study was to investigate comparatively the geometric characteristics and electronic structure of the GeV center in the volume and near-surface (100) of nanodiamond in cluster approximation. It was shown for the first time that formation of isolated dangling bond on the (100) diamond surface leads to formation of unoccupied state in the band gap in vicinity of 1 eV, which is located on the distance of 1.9 eV of conduction band edge. This state in the band gap may influence optical properties of GeV in diamond. |
| Accession Number: WOS:000596090700037 |
| Record 28 of 225 |
| By: Filimonenko, DS (Filimonenko, D. S.); Yasinskii, VM (Yasinskii, V. M.); Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Jelezko, F (Jelezko, F.) |
| Title: Weak Magnetic Field Effects on the Photoluminescence of an Ensemble of NV Centers in Diamond: Experiment and Modelling |
| Source: SEMICONDUCTORS |
| Volume: 54 |
| Issue: 12 |
| Pages: 1730-1733 |
| DOI: 10.1134/S1063782620120076 |
| Published: DEC 2020 |
| Abstract: The relationship between the photoluminescence intensity of the ensemble of NV centers in diamond and external magnetic field was studied. The magnetic spectra exhibit two resonances. The broader one has a width of 20 G and its amplitude is independent of the polarization of the incident radiation. The narrow resonance with a width of 4 G is found to be polarization dependent and is only visible if the direction of magnetic field is more or less perpendicular to the laser light polarization. To describe the appearance of these resonances we have modified the 8-level model of the NV center by taking into account the cross-relaxation between the ground-state spin of the center and other surrounding electronic spins (those of differently aligned NV centers, substitutional N spins etc.). |
| Accession Number: WOS:000596090700039 |
| Record 29 of 225 |
| By: Mindarava, Y (Mindarava, Yuliya); Blinder, R (Blinder, Remi); Laube, C (Laube, Christian); Knolle, W (Knolle, Wolfgang); Abel, B (Abel, Bernd); Jentgens, C (Jentgens, Christian); Isoya, J (Isoya, Junichi); Scheuer, J (Scheuer, Jochen); Lang, J (Lang, Johannes); Schwartz, I (Schwartz, Ilai); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Efficient conversion of nitrogen to nitrogen-vacancy centers in diamond particles with high-temperature electron irradiation |
| Source: CARBON |
| Volume: 170 |
| Pages: 182-190 |
| DOI: 10.1016/j.carbon.2020.07.077 |
| Published: DEC 2020 |
| Abstract: Fluorescent nanodiamonds containing negatively-charged nitrogen-vacancy (NV-) centers are promising for a wide range of applications, such as for sensing, as fluorescence biomarkers, or to hyperpolarize nuclear spins. NV- centers are formed from substitutional nitrogen (P1 centers) defects and vacancies in the diamond lattice. Maximizing the concentration of NVs is most beneficial, which justifies the search for methods with a high yield of conversion from P1 to NV-. We report here the characterization of surface cleaned fluorescent micro- and nanodiamonds, obtained by irradiation of commercial diamond powder with high-energy (10 MeV) electrons and simultaneous annealing at 800 degrees C. Using this technique and increasing the irradiation dose, we demonstrate the creation of NV- with up to 25% conversion yield. Finally, we monitor the creation of irradiation-induced spin-1 defects in microdiamond particles, which we associate with W16 and W33 centers, and investigate the effects of irradiation dose and particle size on the coherence time of NV-. (C) 2020 Elsevier Ltd. All rights reserved. |
| Accession Number: WOS:000579779800018 |
| Record 30 of 225 |
| By: Staacke, R (Staacke, Robert); John, R (John, Roger); Kneiss, M (Kneiss, Max); Osterkamp, C (Osterkamp, Christian); Diziain, S (Diziain, Severine); Jelezko, F (Jelezko, Fedor); Grundmann, M (Grundmann, Marius); Meijer, J (Meijer, Jan) |
| Title: Method of full polarization control of microwave fields in a scalable transparent structure for spin manipulation |
| Source: JOURNAL OF APPLIED PHYSICS |
| Volume: 128 |
| Issue: 19 |
| Article Number: 194301 |
| DOI: 10.1063/5.0030262 |
| Published: NOV 21 2020 |
| Abstract: The application of transparent conducting oxides in electronic devices like solar cells or displays is common. By transferring this technology to quantum sensing and computing in the form of microwave conductors, it is possible to benefit from the advantages of these materials. By using indium tin oxide (ITO), it is demonstrated that at an arbitrary position below the conductor, an arbitrary elliptical microwave polarization can be produced by two independent sources. This is independent of the geometry and size of the ITO, whereby a non-resonant microwave approach can be chosen. Using single nitrogen vacancy (NV) centers in diamond in combination with a cross-like ITO structure, each NV center can be addressed with an ideal (clockwise or anticlockwise) microwave polarization. By optimizing the coupling of the microwave field to the NV centers and minimizing the conductor size, the creation of smaller devices compared to common approaches is possible. |
| Accession Number: WOS:000595264900001 |
| Record 31 of 225 |
| By: Barton, J (Barton, Jan); Gulka, M (Gulka, Michal); Tarabek, J (Tarabek, Jan); Mindarava, Y (Mindarava, Yuliya); Wang, ZY (Wang, Zhenyu); Schimer, J (Schimer, Jiri); Raabova, H (Raabova, Helena); Bednar, J (Bednar, Jan); Plenio, MB (Plenio, Martin B.); Jelezko, F (Jelezko, Fedor); Nesladek, M (Nesladek, Milos); Cigler, P (Cigler, Petr) |
| Title: Nanoscale Dynamic Readout of a Chemical Redox Process Using Radicals Coupled with Nitrogen-Vacancy Centers in Nanodiamonds |
| Source: ACS NANO |
| Volume: 14 |
| Issue: 10 |
| Pages: 12938-12950 |
| DOI: 10.1021/acsnano.0c04010 |
| Published: OCT 27 2020 |
| Abstract: Biocompatible nanoscale probes for sensitive detection of paramagnetic species and molecules associated with their (bio)chemical transformations would provide a desirable tool for a better understanding of cellular redox processes. Here, we describe an analytical tool based on quantum sensing techniques. We magnetically coupled negatively charged nitrogen-vacancy (NV) centers in ranodiamonds (NDs) with nitroxide radicals present in a biomert polymer coating of the NDs. We demonstrated that the T-1 spin relaxation time of the NV centers is very sensitive to the number of nitroxide radicals, with a resolution down to 10 spins per ND (detection of approximately 10-23 mol in a localized volume). The detection is based on T-1 shortening upon the radical attachment, and we propose a theoretical m odel describing this phenomenon. We further show that this colloidally stable, water-soluble system can be used dynamically for spatiotemporal readout of a redox chemical process (oxidation of ascorbic acid) occurring near the ND surface in an aqueous environment under ambient conditions. |
| Accession Number: WOS:000586793400049 |
| PubMed ID: 32790348 |
| Record 32 of 225 |
| By: Tian, JZ (Tian, Jiazhao); Liu, HB (Liu, Haibin); Liu, Y (Liu, Yu); Yang, PC (Yang, Pengcheng); Betzholz, R (Betzholz, Ralf); Said, RS (Said, Ressa S.); Jelezko, F (Jelezko, Fedor); Cai, JM (Cai, Jianming) |
| Title: Quantum optimal control using phase-modulated driving fields |
| Source: PHYSICAL REVIEW A |
| Volume: 102 |
| Issue: 4 |
| Article Number: 043707 |
| DOI: 10.1103/PhysRevA.102.043707 |
| Published: OCT 14 2020 |
| Abstract: Quantum optimal control represents a powerful technique to enhance the performance of quantum experiments by engineering the controllable parameters of the Hamiltonian. However, the computational overhead for the necessary optimization of these control parameters drastically increases as their number grows. We devise a variant of a gradient-free optimal-control method by introducing the idea of phase-modulated driving fields, which allows us to find optimal control fields efficiently. We numerically evaluate its performance and demonstrate the advantages over standard Fourier-basis methods in controlling an ensemble of two-level systems showing an inhomogeneous broadening. The control fields optimized with the phase-modulated method provide an increased robustness against such ensemble inhomogeneities as well as control-field fluctuations and environmental noise, with one order of magnitude less of average search time. Robustness enhancement of single quantum gates is also achieved by the phase-modulated method. Under environmental noise, an XY-8 sequence constituted by optimized gates prolongs the coherence time by 50% compared with standard rectangular pulses in our numerical simulations, showing the application potential of our phase-modulated method in improving the precision of signal detection in the field of quantum sensing. |
| Accession Number: WOS:000579149900006 |
| Record 33 of 225 |
| By: Mindarava, Y (Mindarava, Yuliya); Blinder, R (Blinder, Remi); Liu, Y (Liu, Yan); Scheuer, J (Scheuer, Jochen); Lang, J (Lang, Johannes); Agafonov, V (Agafonov, Viatcheslav); Davydov, VA (Davydov, Valery A.); Laube, C (Laube, Christian); Knolle, W (Knolle, Wolfgang); Abel, B (Abel, Bernd); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Synthesis and coherent properties of C-13-enriched sub-micron diamond particles with nitrogen vacancy color centers |
| Source: CARBON |
| Volume: 165 |
| Pages: 395-403 |
| DOI: 10.1016/j.carbon.2020.04.071 |
| Published: SEP 15 2020 |
| Abstract: Here we report the synthesis of C-13-enriched diamond powder with sub-micron particle sizes via High Pressure High Temperature ( HPHT) growth. Diamond powder with a tailored isotopic enrichment is particularly interesting for implementation of Dynamic Nuclear spin Polarization (DNP) and C-13 enrichment plays an important role for increasing the signal to noise ratio in Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging. We applied Electron Paramagnetic Resonance (EPR) and NMR spectroscopy to the sub-micron diamond material as well as Optically Detected Magnetic Resonance (ODMR) and atomic force microscopy to investigate preselected nano-sized particles. The C-13 spin concentrations were evaluated with NMR for the initial particle ensemble and with ODMR for the nanodiamond fraction, showing the homogeneous distribution of C-13 density in particles with different sizes. The C-13 nuclear spin-lattice relaxation decay (T-1) shows a multiexponential behavior, where the fast relaxing component is attributed to relaxation from surface defects. Additionally, an optical method for estimating the NV- concentration in nanodiamonds is presented. The obtained powder is promising as a base material for the production of C-13-enriched nanodiamonds for DNP applications. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Accession Number: WOS:000545330700010 |
| Record 34 of 225 |
| By: Eberhardt, N (Eberhardt, N.); Loffler, J (Loeffler, J.); Raabe, M (Raabe, M.); Alam, MNA (Alam, M. N. A.); Li, H (Li, H.); Abaei, A (Abaei, A.); Herrmann, H (Herrmann, H.); Solbach, C (Solbach, C.); Jelezko, F (Jelezko, F.); Weil, T (Weil, T.); Beer, AJ (Beer, A. J.); Rasche, V (Rasche, V.); Winter, G (Winter, G.) |
| Title: Multi-modal PET and MRI biodistribution studies of Zr-89-labelled nanodiamonds in mice |
| Source: EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING |
| Volume: 47 |
| Issue: SUPPL 1 |
| Special Issue: SI |
| Pages: S645-S646 |
| Meeting Abstract: EP-280 |
| Supplement: 1 |
| Published: SEP 2020 |
| Conference Title: 33rd Annual Congress of the European-Association-of-Nuclear-Medicine (EANM) |
| Conference Date: OCT 22-30, 2020 |
| Conference Location: ELECTR NETWORK |
| Sponsor(s): European Assoc Nucl Med |
| Accession Number: WOS:000577424101480 |
| Record 35 of 225 |
| By: Loeffler, J (Loeffler, J.); Eberhardt, N (Eberhardt, N.); Fiedler, R (Fiedler, R.); Lau, M (Lau, M.); Raabe, M (Raabe, M.); Alam, MN (Alam, M. N.); Koch, AB (Koch, A. B.); Scheidhauer, E (Scheidhauer, E.); Abaei, A (Abaei, A.); Herrmann, H (Herrmann, H.); Solbach, C (Solbach, C.); Weil, T (Weil, T.); Linden, M (Linden, M.); Jelezko, F (Jelezko, F.); Beer, AJ (Beer, A. J.); Rasche, V (Rasche, V.); Winter, G (Winter, G.) |
| Title: PET and MR imaging for in ovo evaluation of nanoparticle biodistribution |
| Source: EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING |
| Volume: 47 |
| Issue: SUPPL 1 |
| Special Issue: SI |
| Pages: S633-S634 |
| Meeting Abstract: EP-257 |
| Supplement: 1 |
| Published: SEP 2020 |
| Conference Title: 33rd Annual Congress of the European-Association-of-Nuclear-Medicine (EANM) |
| Conference Date: OCT 22-30, 2020 |
| Conference Location: ELECTR NETWORK |
| Sponsor(s): European Assoc Nucl Med |
| Accession Number: WOS:000577424101458 |
| Record 36 of 225 |
| By: Osterkamp, C (Osterkamp, Christian); Balasubramanian, P (Balasubramanian, Priyadharshini); Wolff, G (Wolff, Gerhard); Teraji, T (Teraji, Tokuyuki); Nesladek, M (Nesladek, Milos); Jelezko, F (Jelezko, Fedor) |
| Title: Benchmark for Synthesized Diamond Sensors Based on Isotopically Engineered Nitrogen-Vacancy Spin Ensembles for Magnetometry Applications |
| Source: ADVANCED QUANTUM TECHNOLOGIES |
| Volume: 3 |
| Issue: 9 |
| Article Number: 2000074 |
| DOI: 10.1002/qute.202000074 |
| Early Access Date: AUG 2020 |
| Published: SEP 2020 |
| Abstract: Nitrogen-vacancy (NV) center ensemble in synthetic diamond is a promising and emerging platform for quantum sensing technologies. Realization of such a solid-state based quantum sensor is widely studied and requires reproducible manufacturing of NV centers with controlled spin properties, including the spin bath environment within the diamond crystal. Here, a non-invasive method is reported to benchmark NV ensembles regarding their suitability as ultra-sensitive magnetic field sensors. Imaging and electron spin resonance techniques are presented to determine operating figures and precisely define the optimal material for NV-driven diamond engineering. The functionality of the methods is manifested on examples of chemical vapor deposition synthesized diamond layers containing preferentially aligned, isotopically controlled(15)NV center ensembles. Quantification of the limiting(15)N P1 spin bath, in an otherwise(12)C enriched environment, and the reduction of its influence by applying dynamical decoupling protocols, complete the suggested set of criteria for the analysis of NV ensemble with potential use as magnetometers. |
| Accession Number: WOS:000566009800001 |
| Record 37 of 225 |
| By: Genov, GT (Genov, Genko T.); Ben-Shalom, Y (Ben-Shalom, Yachel); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex); Bar-Gill, N (Bar-Gill, Nir) |
| Title: Efficient and robust signal sensing by sequences of adiabatic chirped pulses |
| Source: PHYSICAL REVIEW RESEARCH |
| Volume: 2 |
| Issue: 3 |
| Article Number: 033216 |
| DOI: 10.1103/PhysRevResearch.2.033216 |
| Published: AUG 7 2020 |
| Abstract: We propose a scheme for sensing of an oscillating field in systems with large inhomogeneous broadening and driving field variation by applying sequences of phased, adiabatic, chirped pulses. These act as a double filter for dynamical decoupling, where the adiabatic changes of the mixing angle during the pulses rectify the signal and partially remove frequency noise. The sudden changes between the pulses act as instantaneous pi pulses in the adiabatic basis for additional noise suppression. We also use the pulses' phases to correct for other errors, e.g., due to nonadiabatic couplings. Our technique improves significantly the coherence time in comparison to standard XY8 dynamical decoupling in realistic simulations in NV centers with large inhomogeneous broadening. Beyond the theoretical proposal, we also present proof-of-principle experimental results for quantum sensing of an oscillating field in NV centers in diamond, demonstrating superior performance compared to the standard technique. |
| Accession Number: WOS:000604148200004 |
| Record 38 of 225 |
| By: Zhou, HY (Zhou, Hengyun); Choi, J (Choi, Joonhee); Choi, S (Choi, Soonwon); Landig, R (Landig, Renate); Douglas, AM (Douglas, Alexander M.); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor); Onoda, S (Onoda, Shinobu); Sumiya, H (Sumiya, Hitoshi); Cappellaro, P (Cappellaro, Paola); Knowles, HS (Knowles, Helena S.); Park, H (Park, Hongkun); Lukin, MD (Lukin, Mikhail D.) |
| Title: Quantum Metrology with Strongly Interacting Spin Systems |
| Source: PHYSICAL REVIEW X |
| Volume: 10 |
| Issue: 3 |
| Article Number: 031003 |
| DOI: 10.1103/PhysRevX.10.031003 |
| Published: JUL 2 2020 |
| Abstract: Quantum metrology is a powerful tool for explorations of fundamental physical phenomena and applications in material science and biochemical analysis. While in principle the sensitivity can be improved by increasing the density of sensing particles, in practice this improvement is severely hindered by interactions between them. Here, using a dense ensemble of interacting electronic spins in diamond, we demonstrate a novel approach to quantum metrology to surpass such limitations. It is based on a new method of robust quantum control, which allows us to simultaneously suppress the undesired effects associated with spin-spin interactions, disorder, and control imperfections, enabling a fivefold enhancement in coherence time compared to state-of-the-art control sequences. Combined with optimal spin state initialization and readout directions, this allows us to achieve an ac magnetic field sensitivity well beyond the previous limit imposed by interactions, opening a new regime of high-sensitivity solid-state ensemble magnetometers. |
| Accession Number: WOS:000544854600002 |
| Record 39 of 225 |
| By: Yang, AH (Yang, Aihong); Zhou, WP (Zhou, Wenpeng); Zhao, SC (Zhao, Shucai); Xu, Y (Xu, Yan); Jelezko, F (Jelezko, Fedor); Li, YX (Li, Yuxia); Peng, YD (Peng, Yandong) |
| Title: Enhanced measurement of microwave electric fields with collective Rabi splitting |
| Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS |
| Volume: 37 |
| Issue: 6 |
| Pages: 1664-1669 |
| DOI: 10.1364/JOSAB.388154 |
| Published: JUN 1 2020 |
| Abstract: The collective effects of intracavity Rydberg atoms are investigated and proposed to detect microwave (MW) electric (E) fields with collective Rabi splitting (CRS). When a cavity field drives atoms from ground states to their excited states and a control field further drives them to Rydberg states where a MW field couples Rydberg states, the cavity transmission exhibits a four-peak characteristic, and two side peaks represent the CRS. It is interesting to find that the frequency splitting of CRS changes linearly with the MW-field strength, which can be used to probe MW E-field strength. In the strong coupling regime, the collective effect of Rydberg atoms broadens the CRS peak distance and could improve the detection sensitivity by about 7 times under the given conditions, compared with the common electromagnetically induced transparency scheme. The effects of atomic density and control-field strength on the CRS spectrum are also discussed. (C) 2020 Optical Society of America |
| Accession Number: WOS:000565328200013 |
| Record 40 of 225 |
| By: Winter, G (Winter, Gordon); Koch, ABF (Koch, Andrea B. F.); Loffler, J (Loeffler, Jessica); Jelezko, F (Jelezko, Fedor); Linden, M (Linden, Mika); Li, H (Li, Hao); Abaei, A (Abaei, Alireza); Zuo, Z (Zuo, Zhi); Beer, AJ (Beer, Ambros J.); Rasche, V (Rasche, Volker) |
| Title: In vivo PET/MRI Imaging of the Chorioallantoic Membrane |
| Source: FRONTIERS IN PHYSICS |
| Volume: 8 |
| Article Number: 151 |
| DOI: 10.3389/fphy.2020.00151 |
| Published: MAY 25 2020 |
| Abstract: The Hen's Egg Test Chorioallantoic Membrane (HET-CAM) of fertilized chick eggs represents a unique model for biomedical research. With its steadily increasing use, non-invasive in ovo imaging for longitudinal direct quantification of the biodistribution of compounds or monitoring of surrogate markers has been introduced. The full range of imaging methods has been applied to the HET-CAM model. From the current perspective, Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET) appear promising techniques, providing detailed anatomical and functional information (MRI) and excellent sensitivity (PET). Especially by combining both techniques, the required sensitivity and anatomical localization of the signal source renders feasible. In the following, a review of recent applications of MRI and PET for in ovo imaging with a special focus on techniques for imaging xenotransplanted tumors on the CAM will be provided. |
| Accession Number: WOS:000540560200001 |
| Record 41 of 225 |
| By: Weggler, T (Weggler, Timo); Ganslmayer, C (Ganslmayer, Christian); Frank, F (Frank, Florian); Eilert, T (Eilert, Tobias); Jelezko, F (Jelezko, Fedor); Michaelis, J (Michaelis, Jens) |
| Title: Determination of the Three-Dimensional Magnetic Field Vector Orientation with Nitrogen Vacany Centers in Diamond |
| Source: NANO LETTERS |
| Volume: 20 |
| Issue: 5 |
| Pages: 2980-2985 |
| DOI: 10.1021/acs.nanolett.9b04725 |
| Published: MAY 13 2020 |
| Abstract: Absolute knowledge about the magnetic field orientation plays a crucial role in single spin-based quantum magnetometry and the application toward spin-based quantum computation. In this paper, we reconstruct the three-dimensional orientation of an arbitrary static magnetic field with individual nitrogen vacancy (NV) centers in diamond. We determine the polar and the azimuthal angle of the magnetic field orientation relative to the diamond lattice. Therefore, we use information from the photoluminescence anisotropy of the NV, together with a simple pulsed optically detected magnetic resonance experiment. Our nanoscopic magnetic field determination is generally applicable and does not rely on special prerequisites such as strongly coupled nuclear spins or particular controllable fields. Hence, our presented results open up new paths for precise NMR reconstructions and the modulation of the electron-electron spin interaction in EPR measurements by specifically tailored magnetic fields. |
| Accession Number: WOS:000535255300009 |
| PubMed ID: 32182080 |
| Record 42 of 225 |
| By: Chen, Y (Chen, Yu); Balasubramanian, P (Balasubramanian, Priyadharshini); Cai, YJ (Cai, Yujie); Rong, YY (Rong, Youying); Liu, Y (Liu, Yan); Jelezko, F (Jelezko, Fedor); Ding, CJ (Ding, Chengjie); Chen, XL (Chen, Xiuliang); Wu, E (Wu, E.) |
| Title: Quantum Calibration of Multi-pixel Photon Counter and Its Application in High-Sensitivity Magnetometry With NV Center Ensemble |
| Source: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS |
| Volume: 26 |
| Issue: 3 |
| Article Number: 3800307 |
| DOI: 10.1109/JSTQE.2020.2991432 |
| Published: MAY-JUN 2020 |
| Abstract: In recent years, quantum detector tomography (QDT) is widely used in many fields, such as non-Gaussian states preparation, quantum metrology, quantum communication and so forth. In this paper, we used QDT to completely characterize a photon-number-resolving detector (PNRD) based on a multi-pixel photon counter (MPPC) at 650 nm, which operated in continuous wave (CW) mode. Reconstructing the positive operator-valued measure (POVM) accurately by QDT could help us theoretically derived the operation performance of MPPC in quantum sensing with nitrogen-vacancy (NV) center ensemble. The reconstruction fidelity of MPPC is larger than 99.94%, which means that QDT is very reliable. Comparing with conventional silicon avalanche photodiode (Si-APD), the fluorescent contrast of optically detected magnetic resonance (ODMR) spectrum of NV center ensemble detected by MPPC could be significantly improved. Since its excellent linearity and outstanding photon-number-resolving capability, MPPC could be further used in the DC magnetometry of NV center ensemble. We can infer that the magnetic field sensitivity can be effectively improved by replacing Si-APD with MPPC. Reportedly, this is an extremely rare research on the application of MPPC in NV center magnetometry. |
| Accession Number: WOS:000542933500001 |
| Record 43 of 225 |
| By: Siampour, H (Siampour, Hamidreza); Wang, O (Wang, Ou); Zenin, VA (Zenin, Vladimir A.); Boroviks, S (Boroviks, Sergejs); Siyushev, P (Siyushev, Petr); Yang, YQ (Yang, Yuanqing); Davydov, VA (Davydov, Valery A.); Kulikova, LF (Kulikova, Liudmila F.); Agafonov, VN (Agafonov, Viatcheslav N.); Kubanek, A (Kubanek, Alexander); Mortensen, NA (Mortensen, N. Asger); Jelezko, F (Jelezko, Fedor); Bozhevolnyi, SI (Bozhevolnyi, Sergey, I) |
| Title: Ultrabright single-photon emission from germanium-vacancy zero-phonon lines: deterministic emitter-waveguide interfacing at plasmonic hot spots |
| Source: NANOPHOTONICS |
| Volume: 9 |
| Issue: 4 |
| Pages: 953-962 |
| DOI: 10.1515/nanoph-2020-0036 |
| Published: APR 2020 |
| Abstract: Striving for nanometer-sized solid-state single-photon sources, we investigate atom-like quantum emitters based on single germanium-vacancy (GeV) centers isolated in crystalline nanodiamonds (NDs). Cryogenic characterization indicated symmetry-protected and bright (>10(6) counts/s with off-resonance excitation) zero-phonon optical transitions with up to 6-fold enhancement in energy splitting of their ground states as compared to that found for GeV centers in bulk diamonds (i.e. up to 870 GI lz in highly strained NDs vs. 150 Gliz in bulk). Utilizing lithographic alignment techniques, we demonstrate an integrated nanophotonic platform for deterministic interfacing plasmonic waveguides with isolated GeV centers in NDs, which enables 10-fold enhancement of single-photon decay rates along with the emission direction control by judiciously designing and positioning a Bragg reflector. This approach allows one to realize the unidirectional emission from single-photon dipolar sources, thereby opening new perspectives for the realization of quantum optical integrated circuits. |
| Accession Number: WOS:000529864500021 |
| Record 44 of 225 |
| By: Rong, YY (Rong, Youying); Ma, JH (Ma, Jianhui); Chen, LX (Chen, Lingxiao); Liu, Y (Liu, Yan); Siyushev, P (Siyushev, Petr); Wu, BT (Wu, Botao); Pan, HF (Pan, Haifeng); Jelezko, F (Jelezko, Fedor); Wu, E (Wu, E.); Zeng, HP (Zeng, Heping) |
| Title: Excited-state lifetime measurement of silicon vacancy centers in diamond by single-photon frequency upconversion (vol 28, 055401, 2018) |
| Source: LASER PHYSICS |
| Volume: 30 |
| Issue: 4 |
| Article Number: 049501 |
| DOI: 10.1088/1555-6611/ab792e |
| Published: APR 2020 |
| Accession Number: WOS:000519973700001 |
| Record 45 of 225 |
| By: Cohen, D (Cohen, Daniel); Nigmatullin, R (Nigmatullin, Ramil); Kenneth, O (Kenneth, Oded); Jelezko, F (Jelezko, Fedor); Khodas, M (Khodas, Maxim); Retzker, A (Retzker, Alex) |
| Title: Utilising NV based quantum sensing for velocimetry at the nanoscale |
| Source: SCIENTIFIC REPORTS |
| Volume: 10 |
| Issue: 1 |
| Article Number: 5298 |
| DOI: 10.1038/s41598-020-61095-y |
| Published: MAR 24 2020 |
| Abstract: Nitrogen-Vacancy (NV) centers in diamonds have been shown in recent years to be excellent magnetometers on the nanoscale. One of the recent applications of the quantum sensor is retrieving the Nuclear Magnetic Resonance (NMR) spectrum of a minute sample, whose net polarization is well below the Signal-to-Noise Ratio (SNR) of classic devices. The information in the magnetic noise of diffusing particles has also been shown in decoherence spectroscopy approaches to provide a method for measuring different physical parameters. Similar noise is induced on the NV center by a flowing liquid. However, when the noise created by diffusion effects is more dominant than the noise of the drift, it is unclear whether the velocity can be efficiently estimated. Here we propose a non-intrusive setup for measuring the drift velocity near the surface of a flow channel based on magnetic field quantum sensing using NV centers. We provide a detailed analysis of the sensitivity for different measurement protocols, and we show that our nanoscale velocimetry scheme outperforms current fluorescence based approaches even when diffusion noise is dominant. Our scheme can be applied for the investigation of microfluidic channels, where the drift velocity is usually low and the flow properties are currently unclear. A better understanding of these properties is essential for the future development of microfluidic and nanofluidic infrastructures. |
| Accession Number: WOS:000563368300005 |
| PubMed ID: 32210251 |
| Record 46 of 225 |
| By: Li, C (Li, Chen); Chen, B (Chen, Bing); Jia, ZM (Jia, Zhengmao); Sun, H (Sun, Hui); Jelezko, EOR (Jelezko, Fedor); Peng, YD (Peng, Yandong); Zeng, QT (Zeng, Qingtian) |
| Title: Proposal of nonlinear measurement of tunneling in quantum wells with Fano interference |
| Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS |
| Volume: 37 |
| Issue: 3 |
| Pages: 852-857 |
| DOI: 10.1364/JOSAB.377442 |
| Published: MAR 1 2020 |
| Abstract: An enhanced absorption spectrum by Fano interference is proposed to measure the tunneling between a discrete state and a continuum in asymmetric quantum wells (QWs). Interestingly, the asymmetry of the enhanced absorption spectrum is sensitive to tunneling strength, which can be used to measure the tunneling in QWs. Further study shows that the asymmetry of a nonlinear absorption spectrum is greater than that of a linear absorption spectrum, indicating better probe sensitivity. The simulation results show that the probe sensitivity based on nonlinear absorption is approximately 10 times larger than that of linear absorption. In addition, the effects of control-field intensity and detuning on probe sensitivity are evaluated. (C) 2020 Optical Society of America |
| Accession Number: WOS:000522793600035 |
| Record 47 of 225 |
| By: Lee, CWY (Lee, Charis W. Y.); Cheng, J (Cheng, Juan); Yiu, YC (Yiu, Y. C.); Chan, K (Chan, K.); Lau, D (Lau, Dominique); Tang, WC (Tang, W. C.); Cheng, KW (Cheng, K. W.); Kong, T (Kong, Tom); Hui, TKC (Hui, Tony K. C.); Jelezko, F (Jelezko, Fedor) |
| Title: Correlation between EPR spectra and coloration of natural diamonds |
| Source: DIAMOND AND RELATED MATERIALS |
| Volume: 103 |
| Article Number: 107728 |
| DOI: 10.1016/j.diamond.2020.107728 |
| Published: MAR 2020 |
| Abstract: White diamonds color grading is one of the basic diamond evaluations. The color value based on a scale that ranges from D to Z, with D being the more colorless and more valuable, among other qualifications. As the diamond grade moves on this scale, its color appears more yellow progressively. This yellowish color, present only in Type I diamonds, is mainly due to the nitrogen related defects such as N-3 center and C-center. The current color grading system is based on a visual method, where gemologist compares the sample with a Master Color set. However, this method is very subjective. Several defects responsible for light absorption in diamond are carrying electron spin and appear in Electron Paramagnetic Resonance (EPR) spectrum. In this study, we developed a new EPR based technique for a quantitative measurement of N-3 Center and C-center in diamond through quantitative EPR spectroscopy. The correlation between EPR spectra and color grades of diamond was established. |
| Accession Number: WOS:000521508800013 |
| Record 48 of 225 |
| By: Kuwahata, A (Kuwahata, Akihiro); Kitaizumi, T (Kitaizumi, Takahiro); Saichi, K (Saichi, Kota); Sato, T (Sato, Takumi); Igarashi, R (Igarashi, Ryuji); Ohshima, T (Ohshima, Takeshi); Masuyama, Y (Masuyama, Yuta); Iwasaki, T (Iwasaki, Takayuki); Hatano, M (Hatano, Mutsuko); Jelezko, F (Jelezko, Fedor); Kusakabe, M (Kusakabe, Moriaki); Yatsui, T (Yatsui, Takashi); Sekino, M (Sekino, Masaki) |
| Title: Magnetometer with nitrogen-vacancy center in a bulk diamond for detecting magnetic nanoparticles in biomedical applications |
| Source: SCIENTIFIC REPORTS |
| Volume: 10 |
| Issue: 1 |
| Article Number: 2483 |
| DOI: 10.1038/s41598-020-59064-6 |
| Published: FEB 12 2020 |
| Abstract: We developed a novel magnetometer that employs negatively charged nitrogen-vacancy (NV-) centers in diamond, to detect the magnetic field generated by magnetic nanoparticles (MNPs) for biomedical applications. The compact probe system is integrated into a fiber-optics platform allowing for a compact design. To detect signals from the MNPs effectively, we demonstrated, for the first time, the application of an alternating current (AC) magnetic field generated by the excitation coil of several hundred microteslas for the magnetization of MNPs in diamond quantum sensing. In the lock-in detection system, the minimum detectable AC magnetic field (at a frequency of 1.025 kHz) was approximately 57.6 nT for one second measurement time. We were able to detect the micromolar concentration of MNPs at distances of a few millimeters. These results indicate that the magnetometer with the NV- centers can detect the tiny amounts of MNPs, thereby offering potential for future biomedical applications. |
| Accession Number: WOS:000562872600002 |
| PubMed ID: 32051447 |
| Record 49 of 225 |
| By: Lang, J (Lang, Johannes); Haussler, S (Haeussler, Stefan); Fuhrmann, J (Fuhrmann, Jens); Waltrich, R (Waltrich, Richard); Laddha, S (Laddha, Sunny); Scharpf, J (Scharpf, Jochen); Kubanek, A (Kubanek, Alexander); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Long optical coherence times of shallow-implanted, negatively charged silicon vacancy centers in diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 116 |
| Issue: 6 |
| Article Number: 064001 |
| DOI: 10.1063/1.5143014 |
| Published: FEB 10 2020 |
| Abstract: The creation of single, negatively charged silicon vacancy (SiV-) centers in well-defined diamond layers close to the host surface is a crucial step for the development of diamond-based quantum optic devices with many applications in nanophotonics, quantum sensing, or quantum information science. Here, we report on the creation of shallow (10nm below the surface), single SiV- centers in diamond using low energy Sithorn ion implantation with subsequent high temperature annealing at 1500 degrees C. We show transition linewidths down to 99MHz and narrow inhomogeneous distributions. Furthermore, we achieved a reduction of homogeneous linewidths by a factor of 2 after removing subsurface damage using oxygen plasma processing. These results not only give insights into the formation process of SiV- centers but also indicate a favorable processing method to fabricate shallow single quantum emitters in diamond perfectly suited for coupling to nanostructures on the diamond surface. Published under license by AIP Publishing. |
| Accession Number: WOS:000538749100001 |
| Record 50 of 225 |
| By: Cao, QY (Cao, Q. -Y.); Yang, PC (Yang, P-C.); Gong, MS (Gong, M. -S.); Yu, M (Yu, M.); Retzker, A (Retzker, A.); Plenio, MB (Plenio, M. B.); Muller, C (Mueller, C.); Tomek, N (Tomek, N.); Naydenov, B (Naydenov, B.); McGuinness, LP (McGuinness, L. P.); Jelezko, F (Jelezko, F.); Cai, JM (Cai, J. -M.) |
| Title: Protecting Quantum Spin Coherence of Nanodiamonds in Living Cells |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 13 |
| Issue: 2 |
| Article Number: 024021 |
| DOI: 10.1103/PhysRevApplied.13.024021 |
| Published: FEB 10 2020 |
| Abstract: Because of its superior coherent and optical properties at room temperature, the nitrogen-vacancy (N-V) center in diamond has become a promising quantum probe for nanoscale quantum sensing. However, the application of N-V-containing nanodiamonds to quantum sensing suffers from their relatively short spin coherence times. Here we demonstrate energy-efficient protection of N-V spin coherence in nanodiamonds using concatenated continuous dynamical decoupling, which exhibits excellent performance with a less-stringent microwave-power requirement. When this is applied to nanodiamonds in living cells, we are able to extend the spin coherence time by an order of magnitude to the T-1 limit of 30 mu s. Further analysis demonstrates concomitant improvements of sensing performance, which shows that our results provide an important step toward in vivo quantum sensing using N-V centers in nanodiamond. |
| Accession Number: WOS:000513243900005 |
| Record 51 of 225 |
| By: Yu, M (Yu, Min); Yang, PC (Yang, Pengcheng); Gong, MS (Gong, Musang); Cao, QY (Cao, Qingyun); Lu, QY (Lu, Qiuyu); Liu, HB (Liu, Haibin); Zhang, SL (Zhang, Shaoliang); Plenio, MB (Plenio, Martin B.); Jelezko, F (Jelezko, Fedor); Ozawa, T (Ozawa, Tomoki); Goldman, N (Goldman, Nathan); Cai, JM (Cai, Jianming) |
| Title: Experimental measurement of the quantum geometric tensor using coupled qubits in diamond |
| Source: NATIONAL SCIENCE REVIEW |
| Volume: 7 |
| Issue: 2 |
| Pages: 254-260 |
| DOI: 10.1093/nsr/nwz193 |
| Published: FEB 2020 |
| Abstract: Geometry and topology are fundamental concepts, which underlie a wide range of fascinating physical phenomena such as topological states of matter and topological defects. In quantum mechanics, the geometry of quantum states is fully captured by the quantum geometric tensor. Using a qubit formed by an NV center in diamond, we perform the first experimental measurement of the complete quantum geometric tensor. Our approach builds on a strong connection between coherent Rabi oscillations upon parametric modulations and the quantum geometry of the underlying states. We then apply our method to a system of two interacting qubits, by exploiting the coupling between the NV center spin and a neighboring C-13 nuclear spin. Our results establish coherent dynamical responses as a versatile probe for quantum geometry, and they pave the way for the detection of novel topological phenomena in solid state. |
| Accession Number: WOS:000528014900005 |
| PubMed ID: 34692040 |
| Record 52 of 225 |
| By: Forneris, J; Ditalia Tchernij, S; Traina, P; Moreva, E; Skukan, N; Jaksic, M; Grilj, V; Bosia, F; Enrico, E; Amato, G; Degiovanni, IP; Naydenov, B; Jelezko, F; Genovese, M; Olivero, P |
| Title: Mapping the Local Spatial Charge in Defective Diamond by Means of N-V Sensors-A Self-Diagnostic Concept |
| Source: Zenodo |
| DOI: dx.doi.org/10.5281/ZENODO.3711402 |
| Published: 2020-09-03 |
| Abstract: Mapping the Local Spatial Charge in Defective Diamond by Means of N-V Sensors-A Self-Diagnostic Concept Electrically active defects have a significant impact on the performance of electronic devices based on wide-band-gap materials. This issue is ubiquitous in diamond science and technology, since the presence of charge traps in the active regions of different classes of diamond-based devices (detectors, power diodes, transistors) can significantly affect their performance, due to the formation of space charge, memory effects, and the degradation of the electronic response associated with radiation-induced damage. Among the most common defects in diamond, the nitrogen-vacancy (N-V) center possesses unique spin properties that enable high-sensitivity field sensing at the nanoscale. Here, we demonstrate that N-V ensembles can be successfully exploited to perform direct local mapping of the internal electric-field distribution of a graphite-diamond-graphite junction exhibiting electrical properties dominated by trap- and space-charge-related conduction mechanisms. By means of optically detected magnetic resonance measurements, we performed both point-by-point readout and spatial mapping of the electric field in the active region at different bias voltages. In this novel 'self-diagnostic” approach, defect complexes represent not only the source of detrimental space-charge effects but also a unique tool for their direct investigation, by providing an insight on the conduction mechanisms that could not be inferred in previous studies on the basis of conventional electrical and optical characterization techniques. This work was supported by the Joint Research Project SIQUST (17FUN06). This project received funding from the European Metrology Programme for Innovation and Research (EMPIR) cofinanced by the Participating States and from the European Unions Horizon 2020 research and innovation programme. Copyright: Creative Commons Attribution 4.0 International Open Access |
| Accession Number: DRCI:DATA2020090018696514 |
| Record 53 of 225 |
| By: Forneris, J; Ditalia Tchernij, S; Traina, P; Moreva, E; Skukan, N; Jaksic, M; Grilj, V; Bosia, F; Enrico, E; Amato, G; Degiovanni, IP; Naydenov, B; Jelezko, F; Genovese, M; Olivero, P |
| Title: Mapping the Local Spatial Charge in Defective Diamond by Means of N-V Sensors-A Self-Diagnostic Concept |
| Source: Zenodo |
| DOI: dx.doi.org/10.5281/ZENODO.3711403 |
| Published: 2020-09-03 |
| Abstract: Mapping the Local Spatial Charge in Defective Diamond by Means of N-V Sensors-A Self-Diagnostic Concept Electrically active defects have a significant impact on the performance of electronic devices based on wide-band-gap materials. This issue is ubiquitous in diamond science and technology, since the presence of charge traps in the active regions of different classes of diamond-based devices (detectors, power diodes, transistors) can significantly affect their performance, due to the formation of space charge, memory effects, and the degradation of the electronic response associated with radiation-induced damage. Among the most common defects in diamond, the nitrogen-vacancy (N-V) center possesses unique spin properties that enable high-sensitivity field sensing at the nanoscale. Here, we demonstrate that N-V ensembles can be successfully exploited to perform direct local mapping of the internal electric-field distribution of a graphite-diamond-graphite junction exhibiting electrical properties dominated by trap- and space-charge-related conduction mechanisms. By means of optically detected magnetic resonance measurements, we performed both point-by-point readout and spatial mapping of the electric field in the active region at different bias voltages. In this novel 'self-diagnostic” approach, defect complexes represent not only the source of detrimental space-charge effects but also a unique tool for their direct investigation, by providing an insight on the conduction mechanisms that could not be inferred in previous studies on the basis of conventional electrical and optical characterization techniques. This work was supported by the Joint Research Project SIQUST (17FUN06). This project received funding from the European Metrology Programme for Innovation and Research (EMPIR) cofinanced by the Participating States and from the European Unions Horizon 2020 research and innovation programme. Copyright: Creative Commons Attribution 4.0 International Open Access |
| Accession Number: DRCI:DATA2020090018696515 |
| Record 54 of 225 |
| By: Schmidt, A (Schmidt, Alexander); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Reithmaier, JP (Reithmaier, Johann Peter); Popov, C (Popov, Cyril) |
| Title: Fabrication of highly dense arrays of nanocrystalline diamond nanopillars with integrated silicon-vacancy color centers during the growth |
| Source: OPTICAL MATERIALS EXPRESS |
| Volume: 9 |
| Issue: 12 |
| Pages: 4545-4555 |
| DOI: 10.1364/OME.9.004545 |
| Published: DEC 1 2019 |
| Abstract: Highly dense arrays of diamond nanopillars have been fabricated using nanocrystalline diamond films (NCD) as the starting material. The fabrication process consisted of electron beam lithography (EBL), aluminum mask deposition and inductively coupled O-2 plasma reactive ion etching. The EBL pattern fidelity was enhanced by proximity corrections and dose variations. Optical characterizations of the arrays indicated the incorporation of silicon-vacancy centers during NCD growth as well as enhanced fluorescence and photoluminescence intensities in the well-developed pillar arrays. Transferring this fabrication method to monocrystalline diamond, such dense arrays of diamond nanopillars could be applied in quantum photonics as emitter arrays or photonic crystals upon integration of color centers. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement |
| Accession Number: WOS:000499348700006 |
| Record 55 of 225 |
| By: Aharon, N (Aharon, Nati); Rotem, A (Rotem, Amit); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex); Ringel, Z (Ringel, Zohar) |
| Title: NV center based nano-NMR enhanced by deep learning |
| Source: SCIENTIFIC REPORTS |
| Volume: 9 |
| Article Number: 17802 |
| DOI: 10.1038/s41598-019-54119-9 |
| Published: NOV 28 2019 |
| Abstract: The growing field of nano nuclear magnetic resonance (nano-NMR) seeks to estimate spectra or discriminate between spectra of minuscule amounts of complex molecules. While this field holds great promise, nano-NMR experiments suffer from detrimental inherent noise. This strong noise masks to the weak signal and results in a very low signal-to-noise ratio. Moreover, the noise model is usually complex and unknown, which renders the data processing of the measurement results very complicated. Hence, spectra discrimination is hard to achieve and in particular, it is difficult to reach the optimal discrimination. In this work we present strong indications that this difficulty can be overcome by deep learning (DL) algorithms.The DL algorithms can mitigate the adversarial effects of the noise efficiently by effectively learning the noise model. We show that in the case of frequency discrimination DL algorithms reach the optimal discrimination without having any pre-knowledge of the physical model. Moreover, the DL discrimination scheme outperform Bayesian methods when verified on noisy experimental data obtained by a single Nitrogen-Vacancy (NV) center. In the case of frequency resolution we show that this approach outperforms Bayesian methods even when the latter have full pre-knowledge of the noise model and the former has none. These DL algorithms also emerge as much more efficient in terms of computational resources and run times. Since in many real-world scenarios the noise is complex and difficult to model, we argue that DL is likely to become a dominant tool in the field. |
| Accession Number: WOS:000499326200001 |
| PubMed ID: 31780783 |
| Record 56 of 225 |
| By: Harvey, S (Harvey, Sean); Raabe, M (Raabe, Marco); Ermakova, A (Ermakova, Anna); Wu, YK (Wu, Yingke); Zapata, T (Zapata, Todd); Chen, CJ (Chen, Chaojian); Lu, H (Lu, Hao); Jelezko, F (Jelezko, Fedor); Ng, DYW (Ng, David Y. W.); Weil, T (Weil, Tanja) |
| Title: Transferrin-Coated Nanodiamond-Drug Conjugates for Milliwatt Photothermal Applications |
| Source: ADVANCED THERAPEUTICS |
| Volume: 2 |
| Issue: 11 |
| Article Number: 1900067 |
| DOI: 10.1002/adtp.201900067 |
| Published: NOV 2019 |
| Abstract: Fluorescent nanodiamonds (fNDs) are unique carbon-based nanomaterials due to their outstanding optical and magnetic properties. However, realization of the full potential of fNDs is often limited by their processability because fNDs aggregate strongly in both organic and aqueous solutions. Therefore, robust and potentially universal coating strategies are urgently needed to address these limitations. Derived from mussel foot proteins, the polymerization of L-3,4-dihydroxyphenylalanine (L-DOPA) provides important surface functional groups including amines, carboxylic acid, alcohols, and conjugated Michael acceptors. Herein, L-DOPA is polymerized on fNDs with a high control over the shell thickness. Photoluminescence and optically detected magnetic resonance studies reveal that the unique photophysical properties of fNDs are preserved after thin poly(LDOPA) film coating. Subsequently, conjugation of transferrin, a heme protein that provides efficient receptor-specific cellular transport, improves the colloidal stability and cellular uptake of the poly(L-DOPA)-coated fNDs. The loading of FDA-approved indocyanine green as a photothermal agent yields an integrated biohybrid material exhibiting an amplified photothermal effect in cells at very low energy intake (approximate to 90 mW cm(-2)). |
| Accession Number: WOS:000506361200001 |
| Record 57 of 225 |
| By: Balasubramanian, P (Balasubramanian, Priyadharshini); Metsch, MH (Metsch, Mathias H.); Reddy, P (Reddy, Prithvi); Rogers, LJ (Rogers, Lachlan J.); Manson, NB (Manson, Neil B.); Doherty, MW (Doherty, Marcus W.); Jelezko, F (Jelezko, Fedor) |
| Title: Discovery of ST1 centers in natural diamond |
| Source: NANOPHOTONICS |
| Volume: 8 |
| Issue: 11 |
| Special Issue: SI |
| Pages: 1993-2002 |
| DOI: 10.1515/nanoph-2019-0148 |
| Published: NOV 2019 |
| Abstract: The ST1 center is a point defect in diamond with bright fluorescence and a mechanism for optical spin initialization and readout. The center has impressive potential for applications in diamond quantum computing as a quantum bus to a register of nuclear spins. This is because it has an exceptionally high readout contrast, and unlike the well-known nitrogen-vacancy center, it does not have a ground state electronic spin that decoheres the nuclear spins. However, its chemical structure is unknown, and there are large gaps in our understanding of its properties. We present the discovery of ST1 centers in natural diamond. Our experiments identify interesting power dependence of the center's optical dynamics and reveal new electronic structure. We also present a theory of its electron-phonon interactions, which we combine with previous experiments, to shortlist likely candidates for its chemical structure. |
| Accession Number: WOS:000495740200008 |
| Record 58 of 225 |
| By: Haussler, S (Haeussler, Stefan); Hartung, L (Hartung, Lukas); Fehler, KG (Fehler, Konstantin G.); Antoniuk, L (Antoniuk, Lukas); Kulikova, LF (Kulikova, Liudmila F.); Davydov, VA (Davydov, Valery A.); Agafonov, VN (Agafonov, Viatcheslav N.); Jelezko, F (Jelezko, Fedor); Kubanek, A (Kubanek, Alexander) |
| Title: Preparing single SiV? center in nanodiamonds for external, optical coupling with access to all degrees of freedom |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 21 |
| Issue: 10 |
| Article Number: 103047 |
| DOI: 10.1088/1367-2630/ab4cf7 |
| Published: OCT 2019 |
| Abstract: Optical coupling enables intermediate- and long-range interactions between distant quantum emitters. Such interaction may be the basic element in bottom-up approaches of coupled spin systems or for integrated quantum photonics and quantum plasmonics. Here, we prepare nanodiamonds carrying single, negatively-charged silicon-vacancy centers for evanescent optical coupling with access to all degrees of freedom by means of atomic force nanomanipulation. The color centers feature excellent optical properties, comparable to silicon-vacancy centers in bulk diamond, resulting in a resolvable fine structure splitting, a linewidth close to the Fourier-Transform limit under resonant excitation and a good polarization contrast. We determine the orbital relaxation time T-1 of the orbitally split ground states and show that all optical properties are conserved during translational nanomanipulation. Furthermore, we demonstrate the rotation of the nanodiamonds. In contrast to the translational operation, the rotation leads to a change in polarization contrast. We utilize the change in polarization contrast before and after nanomanipulation to determine the rotation angle. Finally, we evaluate the likelihood for indistinguishable, single photon emission of silicon-vacancy centers located in different nanodiamonds. Our work enables ideal evanescent, optical coupling of distant nanodiamonds containing silicon-vacancy centers with applications in the realization of quantum networks, quantum repeaters or complex quantum systems. |
| Accession Number: WOS:000493111100003 |
| Record 59 of 225 |
| By: Unden, TK (Unden, T. K.); Louzon, D (Louzon, D.); Zwolak, M (Zwolak, M.); Zurek, WH (Zurek, W. H.); Jelezko, F (Jelezko, F.) |
| Title: Revealing the Emergence of Classicality Using Nitrogen-Vacancy Centers |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 123 |
| Issue: 14 |
| Article Number: 140402 |
| DOI: 10.1103/PhysRevLett.123.140402 |
| Published: OCT 1 2019 |
| Abstract: The origin of classical reality in our quantum world is a long-standing mystery. Here, we examine a nitrogen-vacancy center in diamond evolving in the presence of its magnetic nuclear spin environment which is formed by the natural appearance of carbon C-13 atoms in the diamond lattice, to study quantum Darwinism- the proliferation of information about preferred quantum states throughout the world via the environment. This redundantly imprinted information accounts for the perception of objective reality, as it is independently accessible by many without perturbing the system of interest. To observe this process, we implement a novel dynamical decoupling scheme that enables the measurement and control of several nuclear spins (the environment epsilon) interacting with a nitrogen vacancy (the system S). Our experiment demonstrates that, in the course of the decoherence of S, redundant information is indeed imprinted onto E, giving rise to incipient classical objectivity-a consensus recorded in redundant copies, and available from the fragments of the nuclear spin environment E, about the state of S. This provides the first laboratory verification of the process responsible for the emergence of the objective classical world from the underlying quantum substrate. |
| Accession Number: WOS:000488514800001 |
| PubMed ID: 31702205 |
| Record 60 of 225 |
| By: Balasubramanian, P (Balasubramanian, Priyadharshini); Osterkamp, C (Osterkamp, Christian); Chen, Y (Chen, Yu); Chen, X (Chen, Xiuliang); Teraji, T (Teraji, Tokuyuki); Wu, E (Wu, E.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: dc Magnetometry with Engineered Nitrogen-Vacancy Spin Ensembles in Diamond |
| Source: NANO LETTERS |
| Volume: 19 |
| Issue: 9 |
| Pages: 6681-6686 |
| DOI: 10.1021/acs.nanolett.9b02993 |
| Published: SEP 2019 |
| Abstract: The exquisite optical and spin properties of nitrogen-vacancy (NV) centers in diamond have made them a promising platform for quantum sensing. The prospect of NV-based sensors relies on the controlled production of these atomic-scale defects. Here we report on the fabrication of a preferentially oriented, shallow ensemble of NV centers and their applicability for sensing dc magnetic fields. For the present sample, the residual paramagnetic impurities are the dominant source of environmental noise, limiting the dephasing time (T-2*) of the NVs. By controlling the P1 spin-bath, we achieve a 4-fold improvement in the T-2* of the NV ensemble. Further, we show that combining spin-bath control and homonuclear decoupling sequence cancels NV-NV interactions and partially protects the sensors from a broader spin environment, thus extending the ensemble T-2* up to 10 mu s. With this decoupling protocol, we measure an improved dc magnetic field sensitivity of 1.2 nT mu m(3/2) Hz(-1/2). Using engineered NVs and decoupling protocols, we demonstrate the prospects of harnessing the full potential of NV-based ensemble magnetometry. |
| Accession Number: WOS:000486361900109 |
| PubMed ID: 31430171 |
| Record 61 of 225 |
| By: Malykhin, S (Malykhin, Sergei); Mindarava, Y (Mindarava, Yuliya); Ismagilov, R (Ismagilov, Rinat); Orekhov, A (Orekhov, Anton); Jelezko, F (Jelezko, Fedor); Obraztsov, A (Obraztsov, Alexander) |
| Title: Formation of GeV, SiV, and NV Color Centers in Single Crystal Diamond Needles Grown by Chemical Vapor Deposition |
| Source: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS |
| Volume: 256 |
| Issue: 9 |
| Article Number: 1800721 |
| DOI: 10.1002/pssb.201800721 |
| Published: SEP 2019 |
| Abstract: Herein the color centers formation in diamond crystallites of pyramidal shape grown by chemical vapor deposition (CVD) is described. The individual crystallites are extracted from polycrystalline films grown on silicon substrates. The silicon-vacancy (SiV), germanium-vacancy (GeV), and nitrogen-vacancy (NV) centers are created by introducing corresponding precursors from substrate material, gaseous nitrogen, and thermally evaporated germanium added during CVD. Some amount of NV centers detected in all types of the diamond crystallites is assigned to uncontrollable presence of nitrogen in the CVD reactor. The low temperature photoluminescence spectra indicate presence of ensembles of SiV centers in diamond structure. The SiV centers are concentrated predominantly at apexes of the diamond crystallites located at substrate surface. Intense growth of CN radicals in plasma-activated gas environment during CVD process is detected after nitrogen gas addition. The crystallites obtained with the nitrogen addition demonstrate significant variation of their pyramid angle. The photoluminescence spectra of crystallites grown with nitrogen addition demonstrate increase of both negatively and neutrally charged states of NV color center. The GeV centers are created via thermal evaporation of pure Ge during CVD growth. The photoluminescence spectra of the crystallites grown with Ge addition demonstrate presence of GeV color centers ensemble. |
| Accession Number: WOS:000486543000016 |
| Record 62 of 225 |
| By: Dietrich, A (Dietrich, A.); Burk, M (Buerk, M.); Steiger, ES (Steiger, E. S.); Antoniuk, L (Antoniuk, L.); Tran, TT (Tran, T. T.); Nguyen, M (Nguyen, M.); Aharonovich, I (Aharonovich, I.); Jelezko, F (Jelezko, F.); Kubanek, A (Kubanek, A.) |
| Title: Reply to "Comment on 'Observation of Fourier transform limited lines in hexagonal boron nitride"' |
| Source: PHYSICAL REVIEW B |
| Volume: 100 |
| Issue: 4 |
| Article Number: 047402 |
| DOI: 10.1103/PhysRevB.100.047402 |
| Published: JUL 23 2019 |
| Abstract: In this Reply, we answer to the comments by Langbein [Phys. Rev. B 100, 047401 (2019)]. We disagree with the argument that our measured spectral shapes and the extracted linewidths are caused by temporal blinking. We give detailed information on our evaluation process to exclude blinking events. Beyond the question raised in the Comment, we analyze the influence of spectral diffusion. Although spectral diffusion is an ongoing limitation for defect centers in hexagonal boron nitride, we prove that it is not influencing our extracted linewidths. |
| Accession Number: WOS:000477892000006 |
| Record 63 of 225 |
| By: Genov, GT (Genov, Genko T.); Aharon, N (Aharon, Nati); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex) |
| Title: Mixed dynamical decoupling |
| Source: QUANTUM SCIENCE AND TECHNOLOGY |
| Volume: 4 |
| Issue: 3 |
| Article Number: 035010 |
| DOI: 10.1088/2058-9565/ab2afd |
| Published: JUL 2019 |
| Abstract: We propose a scheme for mixed dynamical decoupling (MDD), where we combine continuous dynamical decoupling with robust sequences of phased pulses. Specifically, we use two fields for decoupling, where the first continuous driving field creates dressed states that are robust to environmental noise. Then, a second field implements a robust sequence of phased pulses to perform inversions of the dressed qubits, thus achieving robustness to amplitude fluctuations of both fields. We show that MDD outperforms standard concatenated continuous dynamical decoupling in realistic numerical simulations for dynamical decoupling in NV centers in diamond. Finally, we also demonstrate how our technique can be utilized for improved sensing. |
| Accession Number: WOS:000474688900001 |
| Record 64 of 225 |
| By: Wang, ZY (Wang, Zhen-Yu); Lang, JE (Lang, Jacob E.); Schmitt, S (Schmitt, Simon); Lang, J (Lang, Johannes); Casanova, J (Casanova, Jorge); McGuinness, L (McGuinness, Liam); Monteiro, TS (Monteiro, Tania S.); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.) |
| Title: Randomization of Pulse Phases for Unambiguous and Robust Quantum Sensing |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 122 |
| Issue: 20 |
| Article Number: 200403 |
| DOI: 10.1103/PhysRevLett.122.200403 |
| Published: MAY 24 2019 |
| Abstract: We develop theoretically and demonstrate experimentally a universal dynamical decoupling method for robust quantum sensing with unambiguous signal identification. Our method uses randomization of control pulses to simultaneously suppress two types of errors in the measured spectra that would otherwise lead to false signal identification. These are spurious responses due to finite-width pi pulses, as well as signal distortion caused by pi pulse imperfections. For the cases of nanoscale nuclear-spin sensing and ac magnetometry, we benchmark the performance of the protocol with a single nitrogen vacancy center in diamond against widely used nonrandomized pulse sequences. Our method is general and can be combined with existing multipulse quantum sensing sequences to enhance their performance. |
| Accession Number: WOS:000469036300003 |
| PubMed ID: 31172750 |
| Record 65 of 225 |
| By: Metsch, MH (Metsch, Mathias H.); Senkalla, K (Senkalla, Katharina); Tratzmiller, B (Tratzmiller, Benedikt); Scheuer, J (Scheuer, Jochen); Kern, M (Kern, Michael); Achard, J (Achard, Jocelyn); Tallaire, A (Tallaire, Alexandre); Plenio, MB (Plenio, Martin B.); Siyushev, P (Siyushev, Petr); Jelezko, F (Jelezko, Fedor) |
| Title: Initialization and Readout of Nuclear Spins via a Negatively Charged Silicon-Vacancy Center in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 122 |
| Issue: 19 |
| Article Number: 190503 |
| DOI: 10.1103/PhysRevLett.122.190503 |
| Published: MAY 17 2019 |
| Abstract: In this Letter, we demonstrate initialization and readout of nuclear spins via a negatively charged silicon-vacancy (SiV) electron spin qubit. Under Hartmann-Hahn conditions the electron spin polarization is coherently transferred to the nuclear spin. The readout of the nuclear polarization is observed via the fluorescence of the SiV. We also show that the coherence time of the nuclear spin (6 ms) is limited by the electron spin-lattice relaxation due to the hyperfine coupling to the electron spin. This Letter paves the way toward realization of building blocks of quantum hardware with an efficient spin-photon interface based on the SiV color center coupled to a long lasting nuclear memory. |
| Accession Number: WOS:000468229900002 |
| PubMed ID: 31144926 |
| Record 66 of 225 |
| By: Schwartz, I (Schwartz, Ilai); Rosskopf, J (Rosskopf, Joachim); Schmitt, S (Schmitt, Simon); Tratzmiller, B (Tratzmiller, Benedikt); Chen, Q (Chen, Qiong); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.) |
| Title: Blueprint for nanoscale NMR |
| Source: SCIENTIFIC REPORTS |
| Volume: 9 |
| Article Number: 6938 |
| DOI: 10.1038/s41598-019-43404-2 |
| Published: MAY 6 2019 |
| Abstract: Nitrogen vacancy (NV) centers in diamond have been used as ultrasensitive magnetometers to perform nuclear magnetic resonance (NMR) spectroscopy of statistically polarized samples at 1-100 nm length scales. However, the spectral linewidth is typically limited to the kHz level, both by the NV sensor coherence time and by rapid molecular diffusion of the nuclei through the detection volume which in turn is critical for achieving long nuclear coherence times. Here we provide a blueprint supported by detailed theoretical analysis for a set-up that combines a sensitivity sufficient for detecting NMR signals from nano- to micron-scale samples with a spectral resolution that is limited only by the nuclear spin coherence, i.e. comparable to conventional NMR. Our protocol detects the nuclear polarization induced along the direction of an external magnetic field with near surface NV centers using lock-in detection techniques to enable phase coherent signal averaging. Using the NV centers in a dual role of NMR detector and optical hyperpolarization source to increase signal to noise, and in combination with Bayesian inference models for signal processing, nano/microscale NMR spectroscopy can be performed on sample concentrations in the micromolar range, several orders of magnitude better than the current state of the art. |
| Accession Number: WOS:000466878900038 |
| PubMed ID: 31061430 |
| Record 67 of 225 |
| By: Alkahtani, M (Alkahtani, Masfer); Lang, J (Lang, Johannes); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Hemmer, P (Hemmer, Philip) |
| Title: Growth of High-Purity Low-Strain Fluorescent Nanodiamonds |
| Source: ACS PHOTONICS |
| Volume: 6 |
| Issue: 5 |
| Pages: 1266-1271 |
| DOI: 10.1021/acsphotonics.9b00224 |
| Published: MAY 2019 |
| Abstract: Fluorescent emitters in diamond have far-reaching potential applications in areas like quantum information, advanced biosensing, and materials research (especially magnetic and superconductor materials). However, many of these applications are limited by imperfections in commercially available fluorescent nanodiamonds (FNDs) due to paramagnetic impurities and crystal lattice strains. These limitations are a direct consequence of the way fluorescent nanodiamonds are produced. Here, we show that for high pressure growth, at a relatively low temperature of 400 degrees C, we can produce high-purity and low-strain FNDs after standard irradiation and annealing treatments. This work is a milestone toward the engineering of high-quality ultrasmall fluorescent nanodiamonds. |
| Accession Number: WOS:000468367600025 |
| Record 68 of 225 |
| By: Santagati, R (Santagati, R.); Gentile, AA (Gentile, A. A.); Knauer, S (Knauer, S.); Schmitt, S (Schmitt, S.); Paesani, S (Paesani, S.); Granade, C (Granade, C.); Wiebe, N (Wiebe, N.); Osterkamp, C (Osterkamp, C.); McGuinness, LP (McGuinness, L. P.); Wang, J (Wang, J.); Thompson, MG (Thompson, M. G.); Rarity, JG (Rarity, J. G.); Jelezko, F (Jelezko, F.); Laing, A (Laing, A.) |
| Title: Magnetic-Field Learning Using a Single Electronic Spin in Diamond with One-Photon Readout at Room Temperature |
| Source: PHYSICAL REVIEW X |
| Volume: 9 |
| Issue: 2 |
| Article Number: 021019 |
| DOI: 10.1103/PhysRevX.9.021019 |
| Published: APR 29 2019 |
| Abstract: Nitrogen-vacancy (NV) centers in diamond are appealing nanoscale quantum sensors for temperature, strain, electric fields, and, most notably, magnetic fields. However, the cryogenic temperatures required for low-noise single-shot readout that have enabled the most sensitive NV magnetometry reported to date are impractical for key applications, e.g., biological sensing. Overcoming the noisy readout at room temperature has until now demanded the repeated collection of fluorescent photons, which increases the time cost of the procedure, thus reducing its sensitivity. Here, we show how machine learning can process the noisy readout of a single NV center at room temperature, requiring on average only one photon per algorithm step, to sense magnetic-field strength with a precision comparable to those reported for cryogenic experiments. Analyzing large datasets from NV centers in bulk diamond, we report absolute sensitivities of 60 nT s(1/2) including initialization, readout, and computational overheads. We show that dephasing times can be simultaneously estimated and that time-dependent fields can be dynamically tracked at room temperature. Our results dramatically increase the practicality of early-term single-spin sensors. |
| Accession Number: WOS:000466437400001 |
| Record 69 of 225 |
| By: Osterkamp, C (Osterkamp, Christian); Mangold, M (Mangold, Martin); Lang, J (Lang, Johannes); Balasubramanian, P (Balasubramanian, Priyadharshini); Teraji, T (Teraji, Tokuyuki); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Engineering preferentially-aligned nitrogen-vacancy centre ensembles in CVD grown diamond |
| Source: SCIENTIFIC REPORTS |
| Volume: 9 |
| Article Number: 5786 |
| DOI: 10.1038/s41598-019-42314-7 |
| Published: APR 8 2019 |
| Abstract: Here we report a method for improving the magnetic field sensitivity of an ensemble of Nitrogen-Vacancy (NV) centres in C-12-enriched diamond aligned along the [111] crystal axis. The preferentially-aligned NV centres are fabricated by a Plasma Enhanced Chemical Vapour Deposition (PECVD) process and their concentration is quantitatively determined by analysing the confocal microscopy images. We further observe that annealing the samples at high temperature (1500 degrees C) in vacuum leads to a conversion of substitutional nitrogen into NV centres. This treatment also increases the coherence time of the NV centres electron spins up to 40 mu s, which corresponds to enhancement of the sensitivity by a factor of three. However, this procedure also leads to a loss of the preferential alignment by 34%. |
| Accession Number: WOS:000463695800039 |
| PubMed ID: 30962480 |
| Record 70 of 225 |
| By: Sturner, FM (Stuerner, Felix M.); Brenneis, A (Brenneis, Andreas); Kassel, J (Kassel, Julian); Wostradowski, U (Wostradowski, Uwe); Rolver, R (Roelver, Robert); Fuchs, T (Fuchs, Tino); Nakamura, K (Nakamura, Kazuo); Sumiya, H (Sumiya, Hitoshi); Onoda, S (Onoda, Shinobu); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor) |
| Title: Compact integrated magnetometer based on nitrogen-vacancy centres in diamond |
| Source: DIAMOND AND RELATED MATERIALS |
| Volume: 93 |
| Pages: 59-65 |
| DOI: 10.1016/j.diamond.2019.01.008 |
| Published: MAR 2019 |
| Abstract: We demonstrate an integrated and miniaturised magnetic field sensor based on the negatively charged nitrogen-vacancy centres (NV-) in diamond. The compact device includes all optical components, both for the optical excitation path and for the detection of the emitted fluorescence signal. We experimentally verify that it enables optically detected magnetic resonance (ODMR) measurements and we specify noise and sensitivity of the magnetometer. The minimal detectable magnetic field of the device is approximate to 1 mu T for a given integration time of 1 ms, which is approximately one order of magnitude larger than its photon shot-noise limit. It has the significant advantage over traditional setups using NV- centres (including a laser and a complex optical system) that the specific construction volume is about 2.9 cm(3) with a total power consumption of approximate to 1.5 W, which enables the device for a wide range of industrial sensing applications. |
| Accession Number: WOS:000464627200009 |
| Record 71 of 225 |
| By: Rogers, LJ (Rogers, Lachlan J.); Wang, O (Wang, Ou); Liu, Y (Liu, Yan); Antoniuk, L (Antoniuk, Lukas); Osterkamp, C (Osterkamp, Christian); Davydov, VA (Davydov, Valery A.); Agafonov, VN (Agafonov, Viatcheslav N.); Filipovski, AB (Filipovski, Andrea B.); Jelezko, F (Jelezko, Fedor); Kubanek, A (Kubanek, Alexander) |
| Title: Single Si-V- Centers in Low-Strain Nanodiamonds with Bulklike Spectral Properties and Nanomanipulation Capabilities |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 11 |
| Issue: 2 |
| Article Number: 024073 |
| DOI: 10.1103/PhysRevApplied.11.024073 |
| Published: FEB 28 2019 |
| Abstract: We report on the isolation of single negatively-charged-silicon-vacancy (Si-V-) centers in nanodiamonds. We observe the fine structure of single Si-V- centers with reduced inhomogeneous ensemble linewidth below the excited-state splitting, stable optical transitions, good polarization contrast, and excellent spectral stability under resonant excitation. On the basis of our experimental results, we develop an analytical strain model where we extract the ratio between strain coefficients of excited and ground states as well the intrinsic zero-strain spin-orbit splittings. The observed strain values are as low as the best values in low-strain bulk diamond. We achieve our results by means of H-plasma treatment of the diamond surface and in combination with resonant and off-resonant excitation. Our work paves the way for indistinguishable, single-photon emission. Furthermore, we demonstrate controlled nanomanipulation by an atomic-force-microscope cantilever of one-and two-dimensional alignments with an accuracy of about 10 nm, as well as new tools including dipole rotation and cluster decomposition. Combined, our results show the potential to utilize Si-V- centers in nanodiamonds for controlled interfacing via optical coupling of individually-well-isolated atoms for bottom-up assemblies of complex quantum systems. |
| Accession Number: WOS:000459925100002 |
| Record 72 of 225 |
| By: Siyushev, P (Siyushev, Petr); Nesladek, M (Nesladek, Milos); Bourgeois, E (Bourgeois, Emilie); Gulka, M (Gulka, Michal); Hruby, J (Hruby, Jaroslav); Yamamoto, T (Yamamoto, Takashi); Trupke, M (Trupke, Michael); Teraji, T (Teraji, Tokuyuki); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor) |
| Title: Photoelectrical imaging and coherent spin-state readout of single nitrogen-vacancy centers in diamond |
| Source: SCIENCE |
| Volume: 363 |
| Issue: 6428 |
| Pages: 728-+ |
| DOI: 10.1126/science.aav2789 |
| Published: FEB 15 2019 |
| Abstract: Nitrogen-vacancy (NV) centers in diamond have become an important instrument for quantum sensing and quantum information science. However, the readout of NV spin state requires bulky optical setups, limiting fabrication of miniaturized compact devices for practical use. Here we realized photoelectrical detection of magnetic resonance as well as Rabi oscillations on a single-defect level. Furthermore, photoelectrical imaging of individual NV centers at room temperature was demonstrated, surpassing conventional optical readout methods by providing high imaging contrast and signal-to-noise ratio. These results pave the way toward fully integrated quantum diamond devices. |
| Accession Number: WOS:000458874100030 |
| PubMed ID: 30765564 |
| Record 73 of 225 |
| By: Rotem, A (Rotem, Amit); Gefen, T (Gefen, Tuvia); Oviedo-Casado, S (Oviedo-Casado, Santiago); Prior, J (Prior, Javier); Schmitt, S (Schmitt, Simon); Burak, Y (Burak, Yoram); McGuiness, L (McGuiness, Liam); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex) |
| Title: Limits on Spectral Resolution Measurements by Quantum Probes |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 122 |
| Issue: 6 |
| Article Number: 060503 |
| DOI: 10.1103/PhysRevLett.122.060503 |
| Published: FEB 13 2019 |
| Abstract: The limits of frequency resolution in nano-NMR experiments have been discussed extensively in recent years. It is believed that there is a crucial difference between the ability to resolve a few frequencies and the precision of estimating a single one. Whereas the efficiency of single frequency estimation gradually increases with the square root of the number of measurements, the ability to resolve two frequencies is limited by the specific timescale of the signal and cannot be compensated for by extra measurements. Here we show theoretically and demonstrate experimentally that the relationship between these quantities is more subtle and both are only limited by the Cramer-Rao bound of a single frequency estimation. |
| Accession Number: WOS:000458824200001 |
| PubMed ID: 30822046 |
| Record 74 of 225 |
| By: Choi, J (Choi, Joonhee); Zhou, HY (Zhou, Hengyun); Choi, S (Choi, Soonwon); Landig, R (Landig, Renate); Ho, WW (Ho, Wen Wei); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor); Onoda, S (Onoda, Shinobu); Sumiya, H (Sumiya, Hitoshi); Abanin, DA (Abanin, Dmitry A.); Lukin, MD (Lukin, Mikhail D.) |
| Title: Probing Quantum Thermalization of a Disordered Dipolar Spin Ensemble with Discrete Time-Crystalline Order |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 122 |
| Issue: 4 |
| Article Number: 043603 |
| DOI: 10.1103/PhysRevLett.122.043603 |
| Published: FEB 1 2019 |
| Abstract: We investigate thermalization dynamics of a driven dipolar many-body quantum system through the stability of discrete time crystalline order. Using periodic driving of electronic spin impurities in diamond, we realize different types of interactions between spins and demonstrate experimentally that the interplay of disorder, driving, and interactions leads to several qualitatively distinct regimes of thermalization. For short driving periods, the observed dynamics are well described by an effective Hamiltonian which sensitively depends on interaction details. For long driving periods, the system becomes susceptible to energy exchange with the driving field and eventually enters a universal thermalizing regime, where the dynamics can be described by interaction-induced dephasing of individual spins. Our analysis reveals important differences between thermalization of long-range Ising and other dipolar spin models. |
| Accession Number: WOS:000457706700015 |
| PubMed ID: 30768351 |
| Record 75 of 225 |
| By: Gentile, AA (Gentile, Antonio A.); Santagati, R (Santagati, Raffaele); Knauer, S (Knauer, Sebastian); Schmitt, S (Schmitt, Simon); Paesani, S (Paesani, Stefano); Granade, C (Granade, Chris); Wiebe, N (Wiebe, Nathan); Osterkamp, C (Osterkamp, Christian); McGuinness, LP (McGuinness, Liam P.); Wang, JW (Wang, Jianwei); Thompson, MG (Thompson, Mark G.); Rarity, JG (Rarity, John G.); Jelezko, F (Jelezko, Fedor); Laing, A (Laing, Anthony) |
| Book Group Author(s): IEEE |
| Title: High-sensitivity magnetometry at room temperature with post-processed optical readout of single NV-centres |
| Source: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) |
| Book Series Title: Conference on Lasers and Electro-Optics |
| Published: 2019 |
| Abstract: Optical readout from nanofabricated single NV centres is enhanced via Bayesian inference techniques, to demonstrate efficient magnetometry at room temperature conditions. We achieve experimentally Heisenberg-limited sensitivities O(100 nT s(1/2)), thus competing with state-of-art cryogenic set-ups. (c) 2019 The Author(s) |
| Conference Title: Conference on Lasers and Electro-Optics (CLEO) |
| Conference Date: MAY 05-10, 2019 |
| Conference Location: San Jose, CA |
| Sponsor(s): IEEE; AdValue Photon; Amer Elements; Class5 Photon; Coherent; GoFoton; Light Convers; LightTrans; MKS; OZ Opt Online; Santec; ThorLabs; UQDevices; YSL Photon |
| Accession Number: WOS:000482226302425 |
| Record 76 of 225 |
| By: Gentile, AA (Gentile, Antonio A.); Santagati, R (Santagati, Raffaele); Knauer, S (Knauer, Sebastian); Schmitt, S (Schmitt, Simon); Paesani, S (Paesani, Stefano); Granade, C (Granade, Chris); Wiebe, N (Wiebe, Nathan); Osterkamp, C (Osterkamp, Christian); McGuinness, LP (McGuinness, Liam P.); Wang, JW (Wang, Jianwei); Thompson, MG (Thompson, Mark G.); Rarity, JG (Rarity, John G.); Jelezko, F (Jelezko, Fedor); Laing, A (Laing, Anthony) |
| Book Group Author(s): IEEE |
| Title: Room temperature magnetic field learning with optically readout single NV-centers |
| Source: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC) |
| Published: 2019 |
| Conference Title: Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC) |
| Conference Date: JUN 23-27, 2019 |
| Conference Location: Munich, GERMANY |
| Sponsor(s): European Phys Soc, Quantum Elect & Opt Div; IEEE Photon Soc; Opt Soc; World Photon Congress; EPS Young Minds |
| Accession Number: WOS:000630002700383 |
| Record 77 of 225 |
| By: Nair, SR (Nair, Sarath Raman); Rogers, LJ (Rogers, Lachlan J.); Jeske, J (Jeske, Jan); Vidal, X (Vidal, Xavier); Wood, A (Wood, Andrew); Jelezko, F (Jelezko, Fedor); Greentree, AD (Greentree, Andrew D.); Volz, T (Volz, Thomas) |
| Book Group Author(s): IEEE |
| Title: Towards room-temperature laser magnetometry with NV centres in open fibre cavities |
| Source: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC) |
| Published: 2019 |
| Conference Title: Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC) |
| Conference Date: JUN 23-27, 2019 |
| Conference Location: Munich, GERMANY |
| Sponsor(s): European Phys Soc, Quantum Elect & Opt Div; IEEE Photon Soc; Opt Soc; World Photon Congress; EPS Young Minds |
| Accession Number: WOS:000630002701289 |
| Record 78 of 225 |
| By: Felgen, N (Felgen, Nina); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Reithmaier, JP (Reithmaier, Johann P.); Popov, C (Popov, Cyril) |
| Title: Homoepitaxial Diamond Structures with Incorporated SiV Centers |
| Source: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE |
| Volume: 215 |
| Issue: 22 |
| Special Issue: SI |
| Article Number: 1800371 |
| DOI: 10.1002/pssa.201800371 |
| Published: NOV 21 2018 |
| Abstract: The incorporation of SiV centers during diamond overgrowth on top of partly covered monocrystalline diamond pillars with diameters down to 200 nm are reported. The pillars themselves are prepared via electron beam lithography and inductively coupled plasma reactive ion etching. Then they are covered with a spin-on-glass (SOG) (perhydropolysilazane, PHPS) still jutting the apices of the pillars. After a short overgrowth step and removal of the residual SOG the optical investigations reveal the presence of ensembles of SiV centers in the overgrown part of the pillars, a specific location of the centers, and a very strong PL signal. |
| Accession Number: WOS:000450818100017 |
| Record 79 of 225 |
| By: Shu, ZJ (Shu, Zijun); Liu, Y (Liu, Yu); Cao, QY (Cao, Qingyun); Yang, PC (Yang, Pengcheng); Zhang, SL (Zhang, Shaoliang); Plenio, MB (Plenio, Martin B.); Jelezko, F (Jelezko, Fedor); Cai, JM (Cai, Jianming) |
| Title: Observation of Floquet Raman Transition in a Driven Solid-State Spin System |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 121 |
| Issue: 21 |
| Article Number: 210501 |
| DOI: 10.1103/PhysRevLett.121.210501 |
| Published: NOV 19 2018 |
| Abstract: We experimentally observe Floquet Raman transitions in the weakly driven solid-state spin system of a nitrogen-vacancy center in diamond. The periodically driven spin system simulates a two-band Wannier-Stark ladder model and allows us to observe coherent spin state transfer arising from a Raman transition mediated by Floquet synthetic levels. It also leads to the prediction of an analog photon-assisted Floquet Raman transition and dynamical localization in a driven two-level quantum system. The demonstrated rich Floquet dynamics offers new capabilities to achieve effective Floquet coherent control of a quantum system with potential applications in various types of quantum technologies based on driven quantum dynamics. In particular, the Floquet Raman system may be used as a quantum simulator for the physics of periodically driven systems. |
| Accession Number: WOS:000450552800001 |
| PubMed ID: 30517807 |
| Record 80 of 225 |
| By: Brandenburg, F (Brandenburg, F.); Nagumo, R (Nagumo, R.); Saichi, K (Saichi, K.); Tahara, K (Tahara, K.); Iwasaki, T (Iwasaki, T.); Hatano, M (Hatano, M.); Jelezko, F (Jelezko, F.); Igarashi, R (Igarashi, R.); Yatsui, T (Yatsui, T.) |
| Title: Improving the electron spin properties of nitrogen-vacancy centres in nanodiamonds by near-field etching |
| Source: SCIENTIFIC REPORTS |
| Volume: 8 |
| Article Number: 15847 |
| DOI: 10.1038/s41598-018-34158-4 |
| Published: OCT 26 2018 |
| Abstract: The nitrogen-vacancy (NV) centre in diamond is a promising candidate for quantum computing applications and magnetic sensing applications, because it is an atomic-scale defect with stable coherence time (T-2) and reliable accessibility at room temperature. We demonstrated a method for improving the NV spin properties (the full width half maximum (FWHM) value of the magnetic resonance spectrum and T-2) through a near-field (NF) etching method under ambient conditions. The NF etching method, based on a He-Cd ultraviolet laser (325 nm), which is longer than the absorption edge of the oxygen molecule, enabled selective removal of defects on the nanodiamond surface. We observed a decrease in the FWHM value close to 15% and an increase in T-2 close to 25%. Since our technique can be easily reproduced, a wide range of NV centre applications could be improved, especially magnetic sensing applications. Our results are especially attractive, because they have been obtained under ambient conditions and only require a light source with wavelength slightly above the O-2 absorption edge. |
| Accession Number: WOS:000448421500002 |
| PubMed ID: 30367130 |
| Record 81 of 225 |
| By: Stark, A (Stark, Alexander); Aharon, N (Aharon, Nati); Huck, A (Huck, Alexander); El-Ella, HAR (El-Ella, Haitham A. R.); Retzker, A (Retzker, Alex); Jelezko, F (Jelezko, Fedor); Andersen, UL (Andersen, Ulrik L.) |
| Title: Clock transition by continuous dynamical decoupling of a three-level system |
| Source: SCIENTIFIC REPORTS |
| Volume: 8 |
| Article Number: 14807 |
| DOI: 10.1038/s41598-018-31984-4 |
| Published: OCT 4 2018 |
| Abstract: We present a novel continuous dynamical decoupling scheme for the construction of a robust qubit in a three-level system. By means of a clock transition adjustment, we first show how robustness to environmental noise is achieved, while eliminating drive-noise, to first-order. We demonstrate this scheme with the spin sub-levels of the NV-centre's electronic ground state. By applying drive fields with moderate Rabi frequencies, the drive noise is eliminated and an improvement of 2 orders of magnitude in the coherence time is obtained compared to the pure dephasing time. We then show how the clock transition adjustment can be tuned to eliminate also the second-order effect of the environmental noise with moderate drive fields. A further detailed theoretical investigation suggests an additional improvement of more than 1 order of magnitude in the coherence time which is supported by simulations. Hence, our scheme predicts that the coherence time may be prolonged towards the lifetime-limit using a relatively simple experimental setup. |
| Accession Number: WOS:000446325500019 |
| PubMed ID: 30287884 |
| Record 82 of 225 |
| By: Dietrich, A (Dietrich, A.); Burk, M (Buerk, M.); Steiger, ES (Steiger, E. S.); Antoniuk, L (Antoniuk, L.); Tran, TT (Tran, T. T.); Nguyen, M (Nguyen, M.); Aharonovich, I (Aharonovich, I); Jelezko, F (Jelezko, F.); Kubanek, A (Kubanek, A.) |
| Title: Observation of Fourier transform limited lines in hexagonal boron nitride |
| Source: PHYSICAL REVIEW B |
| Volume: 98 |
| Issue: 8 |
| Article Number: 081414 |
| DOI: 10.1103/PhysRevB.98.081414 |
| Published: AUG 31 2018 |
| Abstract: Single defect centers in layered hexagonal boron nitride are promising candidates as single-photon sources for quantum optics and nanophotonics applications. However, spectral instability hinders many applications. Here, we perform resonant excitation measurements and observe Fourier transform limited linewidths down to approximate to 50 MHz. We investigated the optical properties of more than 600 single-photon emitters (SPEs) in hBN. The SPEs exhibit narrow zero-phonon lines distributed over a spectral range from 580 to 800 nm and with dipolelike emission with a high polarization contrast. Finally, the emitters withstand transfer to a foreign photonic platform, namely, a silver mirror, which makes them compatible with photonic devices such as optical resonators and paves the way to quantum photonics applications. |
| Accession Number: WOS:000443395600005 |
| Record 83 of 225 |
| By: Fukuda, R (Fukuda, Ryosuke); Balasubramanian, P (Balasubramanian, Priyadharshini); Higashimata, I (Higashimata, Itaru); Koike, G (Koike, Godai); Okada, T (Okada, Takuma); Kagami, R (Kagami, Risa); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); Haruyama, M (Haruyama, Moriyoshi); Yamada, K (Yamada, Keisuke); Inaba, M (Inaba, Masafumi); Yamano, H (Yamano, Hayate); Sturner, FM (Stuerner, Felix M.); Schmitt, S (Schmitt, Simon); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor); Ohshima, T (Ohshima, Takeshi); Shinada, T (Shinada, Takahiro); Kawarada, H (Kawarada, Hiroshi); Kada, W (Kada, Wataru); Hanaizumi, O (Hanaizumi, Osamu); Tanii, T (Tanii, Takashi); Isoya, J (Isoya, Junichi) |
| Title: Lithographically engineered shallow nitrogen-vacancy centers in diamond for external nuclear spin sensing |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 20 |
| Article Number: 083029 |
| DOI: 10.1088/1367-2630/aad997 |
| Published: AUG 22 2018 |
| Abstract: The simultaneous control of the number and position of negatively charged nitrogen-vacancy (NV) centers in diamond was achieved. While single near-surface NV centers are known to exhibit outstanding capabilities in external spin sensing, trade-off relationships among the accuracy of the number and position, and the coherence of NV centers have made the use of such engineered NV centers difficult. Namely, low-energy nitrogen implantation with lithographic techniques enables the nanoscale position control but results in degradation of the creation yield and the coherence property. In this paper, we show that low-energy nitrogen ion implantation to a C-12 (99.95%)-enriched homoepitaxial diamond layer using nanomask is applicable to create shallow NV centers with a sufficiently long coherence time for external spin sensing, at a high creation yield. Furthermore, the NV centers were arranged in a regular array so that 40% lattice sites contain single NV centers. The XY8-k measurements using the individual NV centers reveal that the created NV centers have depths from 2 to 12 nm, which is comparable to the stopping range of nitrogen ions implanted at 2.5 keV. We show that the position-controlled NV centers are capable of external spin sensing with a ultra-high spatial resolution. |
| Accession Number: WOS:000442724200002 |
| Record 84 of 225 |
| By: Acin, A (Acin, Antonio); Bloch, I (Bloch, Immanuel); Buhrman, H (Buhrman, Harry); Calarco, T (Calarco, Tommaso); Eichler, C (Eichler, Christopher); Eisert, J (Eisert, Jens); Esteve, D (Esteve, Daniel); Gisin, N (Gisin, Nicolas); Glaser, SJ (Glaser, Steffen J.); Jelezko, F (Jelezko, Fedor); Kuhr, S (Kuhr, Stefan); Lewenstein, M (Lewenstein, Maciej); Riedel, MF (Riedel, Max F.); Schmidt, PO (Schmidt, Piet O.); Thew, R (Thew, Rob); Wallraff, A (Wallraff, Andreas); Walmsley, I (Walmsley, Ian); Wilhelm, FK (Wilhelm, Frank K.) |
| Title: The quantum technologies roadmap: a European community view |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 20 |
| Article Number: 080201 |
| DOI: 10.1088/1367-2630/aad1ea |
| Published: AUG 16 2018 |
| Abstract: Within the last two decades, quantum technologies (QT) have made tremendous progress, moving from Nobel Prize award-winning experiments on quantum physics (1997: Chu, Cohen-Tanoudji, Phillips; 2001: Cornell, Ketterle, Wieman; 2005: Hall, Hansch-, Glauber; 2012: Haroche, Wineland) into a cross-disciplinary field of applied research. Technologies are being developed now that explicitly address individual quantum states and make use of the 'strange' quantum properties, such as superposition and entanglement. The field comprises four domains: quantum communication, where individual or entangled photons are used to transmit data in a provably secure way; quantum simulation, where well-controlled quantum systems are used to reproduce the behaviour of other, less accessible quantum systems; quantum computation, which employs quantum effects to dramatically speed up certain calculations, such as number factoring; and quantum sensing and metrology, where the high sensitivity of coherent quantum systems to external perturbations is exploited to enhance the performance of measurements of physical quantities. In Europe, the QT community has profited from several EC funded coordination projects, which, among other things, have coordinated the creation of a 150-page QT Roadmap (http//qurope.eu/h2020/qtflagship/roadmap2016). This article presents an updated summary of this roadmap. |
| Accession Number: WOS:000441781600001 |
| Record 85 of 225 |
| By: Unden, T (Unden, Thomas); Tomek, N (Tomek, Nikolas); Weggler, T (Weggler, Timo); Frank, F (Frank, Florian); London, P (London, Paz); Zopes, J (Zopes, Jonathan); Degen, C (Degen, Christian); Raatz, N (Raatz, Nicole); Meijer, J (Meijer, Jan); Watanabe, H (Watanabe, Hideyuki); Itoh, KM (Itoh, Kohei M.); Plenio, MB (Plenio, Martin B.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Coherent control of solid state nuclear spin nano-ensembles |
| Source: NPJ QUANTUM INFORMATION |
| Volume: 4 |
| Article Number: 39 |
| DOI: 10.1038/s41534-018-0089-8 |
| Published: AUG 14 2018 |
| Abstract: Detecting and controlling nuclear spin nano-ensembles is crucial for the further development of nuclear magnetic resonance (NMR) spectroscopy and for the emerging solid state quantum technology. Here we present the fabrication of a approximate to 1 nanometre thick diamond layer consisting of C-13 nuclear spins doped with nitrogen-vacancy centres (NV) embedded in a spin-free C-12 crystal matrix. A single NV in the vicinity of the layer is used for polarization of the C-13 spins and the readout of their magnetization. We demonstrate a method for coherent control of few tens of nuclear spins by using radio frequency pulses, and show the basic coherent control experiments, Rabi oscillations and Ramsey spectroscopy, though any NMR pulse sequence can be implemented. The results shown here present an important step towards the realization of a nuclear spin based quantum simulator. |
| Accession Number: WOS:000442305800001 |
| Record 86 of 225 |
| By: Haase, JF (Haase, J. F.); Vetter, PJ (Vetter, P. J.); Unden, T (Unden, T.); Smirne, A (Smirne, A.); Rosskopf, J (Rosskopf, J.); Naydenov, B (Naydenov, B.); Stacey, A (Stacey, A.); Jelezko, F (Jelezko, F.); Plenio, MB (Plenio, M. B.); Huelga, SF (Huelga, S. F.) |
| Title: Controllable Non-Markovianity for a Spin Qubit in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 121 |
| Issue: 6 |
| Article Number: 060401 |
| DOI: 10.1103/PhysRevLett.121.060401 |
| Published: AUG 9 2018 |
| Abstract: We present a flexible scheme to realize non-Markovian dynamics of an electronic spin qubit, using a nitrogen-vacancy center in diamond where the inherent nitrogen spin serves as a regulator of the dynamics. By changing the population of the nitrogen spin, we show that we can smoothly tune the non-Markovianity of the electron spin's dynamics. Furthermore, we examine the decoherence dynamics induced by the spin bath to exclude other sources of non-Markovianity. The amount of collected measurement data is kept at a minimum by employing Bayesian data analysis. This allows for a precise quantification of the parameters involved in the description of the dynamics and a prediction of so far unobserved data points. |
| Accession Number: WOS:000441238200001 |
| PubMed ID: 30141651 |
| Record 87 of 225 |
| By: Schwartz, I (Schwartz, Ilai); Scheuer, J (Scheuer, Jochen); Tratzmiller, B (Tratzmiller, Benedikt); Muller, S (Mueller, Samuel); Chen, Q (Chen, Qiong); Dhand, I (Dhand, Ish); Wang, ZY (Wang, Zhen-Yu); Muller, C (Mueller, Christoph); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.) |
| Title: Robust optical polarization of nuclear spin baths using Hamiltonian engineering of nitrogen-vacancy center quantum dynamics |
| Source: SCIENCE ADVANCES |
| Volume: 4 |
| Issue: 8 |
| Article Number: eaat8978 |
| DOI: 10.1126/sciadv.aat8978 |
| Published: AUG 2018 |
| Abstract: Dynamic nuclear polarization (DNP) is an important technique that uses polarization transfer from electron to nuclear spins to achieve nuclear hyperpolarization. Combining efficient DNP with optically polarized nitrogen-vacancy (NV) centers offers promising opportunities for novel technological applications, including nanoscale nuclear magnetic resonance spectroscopy of liquids, hyperpolarized nanodiamonds as magnetic resonance imaging contrast agents, and the initialization of nuclear spin-based diamond quantum simulators. However, none of the current realizations of polarization transfer are simultaneously robust and sufficiently efficient, making the realization of the applications extremely challenging. We introduce the concept of systematically designing polarization sequences by Hamiltonian engineering, resulting in polarization sequences that are robust and fast. We theoretically derive sequences and experimentally demonstrate that they are capable of efficient polarization transfer from optically polarized NV centers in diamond to the surrounding C-13 nuclear spin bath even in the presence of control errors, making the above mentioned novel applications possible. |
| Accession Number: WOS:000443498100079 |
| PubMed ID: 30182060 |
| Record 88 of 225 |
| By: Gefen, T (Gefen, Tuvia); Khodas, M (Khodas, Maxim); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex) |
| Title: Quantum spectroscopy of single spins assisted by a classical clock |
| Source: PHYSICAL REVIEW A |
| Volume: 98 |
| Issue: 1 |
| Article Number: 013844 |
| DOI: 10.1103/PhysRevA.98.013844 |
| Published: JUL 27 2018 |
| Abstract: Quantum spectroscopy with single two-level systems has considerably improved our ability to detect weak signals. Recently it was realized that for classical signals, precision and resolution of quantum spectroscopy is limited mainly by coherence of the signal and the stability of the clock used to measure time. The coherence time of the quantum probe, which can be significantly shorter, is not a major limiting factor in resolution measurements. Here, we address a similar question for spectroscopy of quantum signals, for example, a quantum sensor is used to detect a single nuclear spin. We present and analyze a novel correlation spectroscopy technique with performance that is limited by the coherence time of the target spins and the stability of the clock. |
| Accession Number: WOS:000439972100012 |
| Record 89 of 225 |
| By: Forneris, J (Forneris, J.); Tchernij, SD (Tchernij, S. Ditalia); Traina, P (Traina, P.); Moreva, E (Moreva, E.); Skukan, N (Skukan, N.); Jaksic, M (Jaksic, M.); Grilj, V (Grilj, V); Bosia, F (Bosia, F.); Enrico, E (Enrico, E.); Amato, G (Amato, G.); Degiovanni, IP (Degiovanni, I. P.); Naydenov, B (Naydenov, B.); Jelezko, F (Jelezko, F.); Genovese, M (Genovese, M.); Olivero, P (Olivero, P.) |
| Title: Mapping the Local Spatial Charge in Defective Diamond by Means of N-V Sensors-A Self-Diagnostic Concept |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 10 |
| Issue: 1 |
| Article Number: 014024 |
| DOI: 10.1103/PhysRevApplied.10.014024 |
| Published: JUL 25 2018 |
| Abstract: Electrically active defects have a significant impact on the performance of electronic devices based on wide-band-gap materials. This issue is ubiquitous in diamond science and technology, since the presence of charge traps in the active regions of different classes of diamond-based devices (detectors, power diodes, transistors) can significantly affect their performance, due to the formation of space charge, memory effects, and the degradation of the electronic response associated with radiation-induced damage. Among the most common defects in diamond, the nitrogen-vacancy (N-V) center possesses unique spin properties that enable high-sensitivity field sensing at the nanoscale. Here, we demonstrate that N-V ensembles can be successfully exploited to perform direct local mapping of the internal electric-field distribution of a graphite-diamond-graphite junction exhibiting electrical properties dominated by trap-and space-chargerelated conduction mechanisms. By means of optically detected magnetic resonance measurements, we performed both point-by-point readout and spatial mapping of the electric field in the active region at different bias voltages. In this novel "self-diagnostic" approach, defect complexes represent not only the source of detrimental space-charge effects but also a unique tool for their direct investigation, by providing an insight on the conduction mechanisms that could not be inferred in previous studies on the basis of conventional electrical and optical characterization techniques. |
| Accession Number: WOS:000439745600001 |
| Record 90 of 225 |
| By: Kucsko, G (Kucsko, G.); Choi, S (Choi, S.); Choi, J (Choi, J.); Maurer, PC (Maurer, P. C.); Zhou, H (Zhou, H.); Landig, R (Landig, R.); Sumiya, H (Sumiya, H.); Onoda, S (Onoda, S.); Isoya, J (Isoya, J.); Jelezko, F (Jelezko, F.); Demler, E (Demler, E.); Yao, NY (Yao, N. Y.); Lukin, MD (Lukin, M. D.) |
| Title: Critical Thermalization of a Disordered Dipolar Spin System in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 121 |
| Issue: 2 |
| Article Number: 023601 |
| DOI: 10.1103/PhysRevLett.121.023601 |
| Published: JUL 9 2018 |
| Abstract: Statistical mechanics underlies our understanding of macroscopic quantum systems. It is based on the assumption that out-of-equilibrium systems rapidly approach their equilibrium states, forgetting any information about their microscopic initial conditions. This fundamental paradigm is challenged by disordered systems, in which a slowdown or even absence of thermalization is expected. We report the observation of critical thermalization in a three dimensional ensemble of similar to 10(6) electronic spins coupled via dipolar interactions. By controlling the spin states of nitrogen vacancy color centers in diamond, we observe slow, subexponential relaxation dynamics and identify a regime of power-law decay with disorder-dependent exponents; this behavior is modified at late times owing to many-body interactions. These observations are quantitatively explained by a resonance counting theory that incorporates the effects of both disorder and interactions. |
| Accession Number: WOS:000437838000008 |
| PubMed ID: 30085738 |
| Record 91 of 225 |
| By: Wojciechowski, AM (Wojciechowski, Adam M.); Karadas, M (Karadas, Mursel); Osterkamp, C (Osterkamp, Christian); Jankuhn, S (Jankuhn, Steffen); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Huck, A (Huck, Alexander); Andersen, UL (Andersen, Ulrik L.) |
| Title: Precision temperature sensing in the presence of magnetic field noise and vice-versa using nitrogen-vacancy centers in diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 113 |
| Issue: 1 |
| Article Number: 013502 |
| DOI: 10.1063/1.5026678 |
| Published: JUL 2 2018 |
| Abstract: We demonstrate a technique for precision sensing of the temperature or the magnetic field by simultaneously driving two hyperfine transitions involving distinct electronic states of the nitrogen-vacancy center in diamond. Frequency modulation of both driving fields is used with either the same or opposite phase, resulting in the immunity to fluctuations in either the magnetic field or the temperature, respectively. In this way, a sensitivity of 1.4 nT Hz(-1/2) or 430 mu K Hz(-1/2) is demonstrated. The presented technique only requires a single frequency demodulator and enables the use of phase-sensitive camera imaging sensors. A simple extension of the method utilizing two demodulators allows for simultaneous, independent, and high-bandwidth monitoring of both the magnetic field and the temperature. Published by AIP Publishing. |
| Accession Number: WOS:000437787000041 |
| Record 92 of 225 |
| By: Xia, KY (Xia, Keyu); Jelezko, F (Jelezko, Fedor); Twamley, J (Twamley, Jason) |
| Title: Quantum routing of single optical photons with a superconducting flux qubit |
| Source: PHYSICAL REVIEW A |
| Volume: 97 |
| Issue: 5 |
| Article Number: 052315 |
| DOI: 10.1103/PhysRevA.97.052315 |
| Published: MAY 14 2018 |
| Abstract: Interconnecting optical photons with superconducting circuits is a challenging problem but essential for building long-range superconducting quantum networks. We propose a hybrid quantum interface between the microwave and optical domains where the propagation of a single-photon pulse along a nanowaveguide is controlled in a coherent way by tuning the electromagnetically induced transparency window with the quantum state of a flux qubit mediated by the spin in a nanodiamond. The qubit can route a single-photon pulse using the nanodiamond into a quantum superposition of paths without the aid of an optical cavity-simplifying the setup. By preparing the flux qubit in a superposition state our cavityless scheme creates a hybrid state-path entanglement between a flying single optical photon and a static superconducting qubit. |
| Accession Number: WOS:000432022200002 |
| Record 93 of 225 |
| By: Nguyen, CT (Nguyen, Christian T.); Evans, RE (Evans, Ruffin E.); Sipahigil, A (Sipahigil, Alp); Bhaskar, MK (Bhaskar, Mihir K.); Sukachev, DD (Sukachev, Denis D.); Agafonov, VN (Agafonov, Viatcheslav N.); Davydov, VA (Davydov, Valery A.); Kulikova, LF (Kulikova, Liudmila F.); Jelezko, F (Jelezko, Fedor); Lukin, MD (Lukin, Mikhail D.) |
| Title: All-optical nanoscale thermometry with silicon-vacancy centers in diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 112 |
| Issue: 20 |
| Article Number: 203102 |
| DOI: 10.1063/1.5029904 |
| Published: MAY 14 2018 |
| Abstract: We demonstrate an all-optical thermometer based on an ensemble of silicon-vacancy centers (SiVs) in diamond by utilizing the sensitivity of the zero-phonon line wavelength to temperature, Delta lambda/Delta T = 0: 0124(2) nm K-1 [6.8(1) GHz K-1]. Using SiVs in bulk diamond, we achieve 70 mK precision at room temperature with a temperature uncertainty sigma(T) = 360 mK/root Hz. Finally, we use SiVs in 200 nm nanodiamonds as local temperature probes with 521 mK/root Hz uncertainty and achieve sub-Kelvin precision. These properties deviate by less than 1% between nanodiamonds, enabling calibration-free thermometry for sensing and control of complex nanoscale systems. Published by AIP Publishing. |
| Accession Number: WOS:000432553900041 |
| Record 94 of 225 |
| By: Rong, YY (Rong, Youying); Ma, JH (Ma, Jianhui); Chen, LX (Chen, Lingxiao); Liu, Y (Liu, Yan); Siyushev, P (Siyushev, Petr); Wu, BT (Wu, Botao); Pan, HF (Pan, Haifeng); Jelezko, F (Jelezko, Fedor); Wu, E (Wu, E.); Zeng, HP (Zeng, Heping) |
| Title: Excited-state lifetime measurement of silicon vacancy centers in diamond by single-photon frequency upconversion |
| Source: LASER PHYSICS |
| Volume: 28 |
| Issue: 5 |
| Article Number: 055401 |
| DOI: 10.1088/1555-6611/aaa02f |
| Published: MAY 2018 |
| Abstract: We report a method with high time resolution to measure the excited-state lifetime of silicon vacancy centers in bulk diamond avoiding timing jitter from the single-photon detectors. Frequency upconversion of the fluorescence emitted from silicon vacancy centers was achieved from 738 nm to 436 nm via sum frequency generation with a short pump pulse. The excited-state lifetime can be obtained by measuring the intensity of upconverted light while the pump delay changes. As a probe, a pump laser with pulse duration of 11 ps provided a high temporal resolution of the measurement. The lifetime extracted from the pump-probe curve was 0.755 ns, which was comparable to the timing jitter of the single-photon detectors. |
| Accession Number: WOS:000429118300001 |
| Record 95 of 225 |
| By: Fernandez-Acebal, P (Fernandez-Acebal, P.); Rosolio, O (Rosolio, O.); Scheuer, J (Scheuer, J.); Muller, C (Mueller, C.); Muller, S (Mueller, S.); Schmitt, S (Schmitt, S.); McGuinness, LP (McGuinness, L. P.); Schwarz, I (Schwarz, I.); Chen, Q (Chen, Q.); Retzker, A (Retzker, A.); Naydenov, B (Naydenov, B.); Jelezko, F (Jelezko, F.); Plenio, MB (Plenio, M. B.) |
| Title: Toward Hyperpolarization of Oil Molecules via Single Nitrogen Vacancy Centers in Diamond |
| Source: NANO LETTERS |
| Volume: 18 |
| Issue: 3 |
| Pages: 1882-1887 |
| DOI: 10.1021/acs.nanolett.7b05175 |
| Published: MAR 2018 |
| Abstract: Efficient polarization of organic molecules is of extraordinary relevance when performing nuclear magnetic resonance (NMR) and imaging. Commercially available routes to dynamical nuclear polarization (DNP) work at extremely low temperatures, relying on the solidification of organic samples and thus bringing the molecules out of their ambient thermal conditions. In this work, we investigate polarization transfer from optically pumped nitrogen vacancy centers in diamond to external molecules at room temperature. This polarization transfer is described by both an extensive analytical analysis and numerical simulations based on spin bath bosonization and is supported by experimental data in excellent agreement. These results set the route to hyperpolarization of diffusive molecules in different scenarios and consequently, due to an increased signal, to high-resolution NMR. |
| Accession Number: WOS:000427910600045 |
| PubMed ID: 29470089 |
| Record 96 of 225 |
| By: Wojciechowski, AM (Wojciechowski, Adam M.); Karadas, M (Karadas, Muersel); Huck, A (Huck, Alexander); Osterkamp, C (Osterkamp, Christian); Jankuhn, S (Jankuhn, Steffen); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Andersen, UL (Andersen, Ulrik L.) |
| Title: Contributed Review: Camera-limits for wide-field magnetic resonance imaging with a nitrogen-vacancy spin sensor |
| Source: REVIEW OF SCIENTIFIC INSTRUMENTS |
| Volume: 89 |
| Issue: 3 |
| Article Number: 031501 |
| DOI: 10.1063/1.5010282 |
| Published: MAR 2018 |
| Abstract: Sensitive, real-time optical magnetometry with nitrogen-vacancy centers in diamond relies on accurate imaging of small (<< 10(-2)), fractional fluorescence changes across the diamond sample. We discuss the limitations on magnetic field sensitivity resulting from the limited number of photoelectrons that a camera can record in a given time. Several types of camera sensors are analyzed, and the smallest measurable magnetic field change is estimated for each type. We show that most common sensors are of a limited use in such applications, while certain highly specific cameras allow achieving nanotesla-level sensitivity in 1 s of a combined exposure. Finally, we demonstrate the results obtained with a lock-in camera that paves the way for real-time, wide-field magnetometry at the nanotesla level and with a micrometer resolution. Published by AIP Publishing. |
| Accession Number: WOS:000428988300001 |
| PubMed ID: 29604724 |
| Record 97 of 225 |
| By: Hovav, Y (Hovav, Y.); Naydenov, B (Naydenov, B.); Jelezko, F (Jelezko, F.); Bar-Gill, N (Bar-Gill, N.) |
| Title: Low-Field Nuclear Polarization Using Nitrogen Vacancy Centers in Diamonds |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 120 |
| Issue: 6 |
| Article Number: 060405 |
| DOI: 10.1103/PhysRevLett.120.060405 |
| Published: FEB 8 2018 |
| Abstract: It was recently demonstrated that bulk nuclear polarization can be obtained using nitrogen vacancy (NV) color centers in diamonds, even at ambient conditions. This is based on the optical polarization of the NV electron spin, and using several polarization transfer methods. One such method is the nuclear orientation via electron spin locking (NOVEL) sequence, where a spin-locked sequence is applied on the NV spin, with a microwave power equal to the nuclear precession frequency. This was performed at relatively high fields, to allow for both polarization transfer and noise decoupling. As a result, this scheme requires accurate magnetic field alignment in order preserve the NV properties. Such a requirement may be undesired or impractical in many practical scenarios. Here we present a new sequence, termed the refocused NOVEL, which can be used for polarization transfer (and detection) even at low fields. Numerical simulations are performed, taking into account both the spin Hamiltonian and spin decoherence, and we show that, under realistic parameters, it can outperform the NOVEL sequence. |
| Accession Number: WOS:000424507800003 |
| PubMed ID: 29481244 |
| Record 98 of 225 |
| By: Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Pushkarchuk, AL (Pushkarchuk, A. L.); Pushkarchuk, VA (Pushkarchuk, V. A.); Kuten, SA (Kuten, S. A.); Zhikol, OA (Zhikol, O. A.); Schmitt, S (Schmitt, S.); Unden, T (Unden, T.); Jelezko, F (Jelezko, F.) |
| Title: Non-flipping C-13 spins near an NV center in diamond: hyperfine and spatial characteristics by density functional theory simulation of the C-510[NV]H-252 cluster |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 20 |
| Article Number: 023022 |
| DOI: 10.1088/1367-2630/aaa910 |
| Published: FEB 8 2018 |
| Abstract: Single NV centers in diamond coupled by hyperfine interaction (hfi) to neighboring C-13 nuclear spins are now widely used in emerging quantum technologies as elements of quantum memory adjusted to a nitrogen-vacancy (NV) center electron spin qubit. For nuclear spins with low flip-flop rate, single shot readout was demonstrated under ambient conditions. Here we report on a systematic search for such stable NV-C-13 systems using density functional theory to simulate the hfi and spatial characteristics of all possible NV-C-13 complexes in the H-terminated cluster C-510[NV]-H-252 hosting the NV center. Along with the expected stable 'NV-axial-C-13' systems wherein the C-13 nuclear spin is located on the NV axis, we found for the first time new families of positions for the C-13 nuclear spin exhibiting negligible hfi-induced flipping rates due to near-symmetric local spin density distribution. Spatially, these positions are located in the diamond bilayer passing through the vacancy of the NV center and being perpendicular to the NV axis. Analysis of available publications showed that, apparently, some of the predicted non-axial near-stable NV-C-13 systems have already been observed experimentally. A special experiment performed on one of these systems confirmed the prediction made. |
| Accession Number: WOS:000424693700002 |
| Record 99 of 225 |
| By: Marseglia, L (Marseglia, L.); Saha, K (Saha, K.); Ajoy, A (Ajoy, A.); Schroder, T (Schroder, T.); Englund, D (Englund, D.); Jelezko, F (Jelezko, F.); Walsworth, R (Walsworth, R.); Pacheco, JL (Pacheco, J. L.); Perry, DL (Perry, D. L.); Bielejec, ES (Bielejec, E. S.); Cappellaro, P (Cappellaro, P.) |
| Title: Bright nanowire single photon source based on SiV centers in diamond |
| Source: OPTICS EXPRESS |
| Volume: 26 |
| Issue: 1 |
| Pages: 80-89 |
| DOI: 10.1364/OE.26.000080 |
| Published: JAN 8 2018 |
| Abstract: The practical implementation of many quantum technologies relies on the development of robust and bright single photon sources that operate at room temperature. The negatively charged silicon-vacancy (SiV-) color center in diamond is a possible candidate for such a single photon source. However, due to the high refraction index mismatch to air, color centers in diamond typically exhibit low photon out-coupling. An additional shortcoming is due to the random localization of native defects in the diamond sample. Here we demonstrate deterministic implantation of Si ions with high conversion efficiency to single SiV- centers, targeted to fabricated nanowires. The co-localization of single SiV- centers with the nanostructures yields a ten times higher light coupling efficiency than for single SiV- centers in bulk diamond. This enhanced photon out-coupling, together with the intrinsic scalability of the SiV- creation method, enables a new class of devices for integrated photonics and quantum science. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement |
| Accession Number: WOS:000419549600006 |
| PubMed ID: 29328295 |
| Record 100 of 225 |
| By: Jelezko, F (Jelezko, Fedor) |
| Edited by: Naumov, AV (Naumov, AV); Gladush, MG (Gladush, MG); Karimullin, KR (Karimullin, KR) |
| Title: Diamond based quantum technologies |
| Source: XIII INTERNATIONAL CONFERENCE ON HOLE BURNING, SINGLE MOLECULE, AND RELATED SPECTROSCOPIES: SCIENCE AND APPLICATIONS (HBSM-2018) |
| Book Series Title: EPJ Web of Conferences |
| Volume: 190 |
| Article Number: 01003 |
| DOI: 10.1051/epjconf/201819001003 |
| Published: 2018 |
| Abstract: Diamond is not only the king gemstone, but also a promising material in quantum technologies. Optically active impurities (colour centers) in diamond show unique coherence properties under ambient conditions. Their quantum state can be readout and manipulated using a combination of single molecule spectroscopy and magnetic resonance techniques. In this talk it will be shown how engineered spins in diamond can be used for creation of non-classical (entangled) quantum states. I will also demonstrate the potential of atomic magnetometers based on single color centers for nanoscale sensing and imaging. New photoelectric detection technique allowing efficient readout of single color centers will be discussed. |
| Conference Title: 13th International Conference on Hole Burning, Single Molecule, and Related Spectroscopies - Science and Applications (HBSM) |
| Conference Date: AUG 06-12, 2018 |
| Conference Location: Suzdal, RUSSIA |
| Sponsor(s): Russian Acad Sci, Inst Spectroscopy; Minist Sci & Higher Educ Russian Federat; Russian Acad Sci; SCONTEL; EPS Young Minds; TechnoInfo; Russian Fdn Basic Res; NT MDT Spectrum Instruments; AVESTA; eLas; Moscow State Pedag Univ |
| Accession Number: WOS:000463775100003 |
| Record 101 of 225 |
| By: Malykhin, SA (Malykhin, Sergey A.); Ismagilov, RR (Ismagilov, Rinat R.); Tuyakova, FT (Tuyakova, Feruza T.); Obraztsova, EA (Obraztsova, Ekaterina A.); Fedotov, PV (Fedotov, Pavel V.); Ermakova, A (Ermakova, Anna); Siyushev, P (Siyushev, Petr); Katamadze, KG (Katamadze, Konstantin G.); Jelezko, F (Jelezko, Fedor); Rakovich, YP (Rakovich, Yury P.); Obraztsov, AN (Obraztsov, Alexander N.) |
| Title: Photoluminescent properties of single crystal diamond microneedles |
| Source: OPTICAL MATERIALS |
| Volume: 75 |
| Pages: 49-55 |
| DOI: 10.1016/j.optmat.2017.10.019 |
| Published: JAN 2018 |
| Abstract: Single crystal needle-like diamonds shaped as rectangular pyramids were produced by combination of chemical vapor deposition and selective oxidation with dimensions and geometrical characteristics depending on the deposition process parameters. Photoluminescence spectra and their dependencies on wavelength of excitation radiation reveal presence of nitrogen- and silicon-vacancy color centers in the diamond crystallites. Photoluminescence spectra, intensity mapping, and fluorescence lifetime imaging microscopy indicate that silicon-vacancy centers are concentrated at the crystallites apex while nitrogen vacancy centers are distributed over the whole crystallite. Dependence of the photoluminescence on excitation radiation intensity demonstrates saturation and allows estimation of the color centers density. The combination of structural parameters, geometry and photoluminescent characteristics are prospective for advantageous applications of these diamond crystallites in quantum information processing and optical sensing. (C) 2017 Elsevier B.V. All rights reserved. |
| Accession Number: WOS:000423890300009 |
| Record 102 of 225 |
| By: Anders, J (Anders, J.); Pfau, T (Pfau, T.); Wrachtrup, J (Wrachtrup, J.); Plenio, MB (Plenio, M. B.); Jelezko, F (Jelezko, F.); Lips, K (Lips, K.) |
| Book Group Author(s): IEEE |
| Title: Towards IC-based quantum sensing - recent achievements and future research trends |
| Source: 2018 48TH EUROPEAN SOLID-STATE DEVICE RESEARCH CONFERENCE (ESSDERC) |
| Book Series Title: Proceedings of the European Solid-State Device Research Conference |
| Pages: 122-125 |
| Published: 2018 |
| Abstract: This paper describes some of the recent trends in the use of integrated circuit (IC) technology for the design of smart quantum sensors. To this end, after a brief introduction into the topic of quantum sensing including its intrinsic advantages and associated challenges, a number of emerging applications including the fields of IC-based inductive electron and nuclear spin detection as well as Rydberg gas sensing and NV center based sensing are used to highlight the great potential of the IC-based quantum sensing approach. |
| Conference Title: 48th European Solid-State Device Research Conference (ESSDERC) |
| Conference Date: SEP 03-06, 2018 |
| Conference Location: Dresden, GERMANY |
| Accession Number: WOS:000790811600033 |
| Record 103 of 225 |
| By: Iwasaki, T (Iwasaki, Takayuki); Miyamoto, Y (Miyamoto, Yoshiyuki); Taniguchi, T (Taniguchi, Takashi); Siyushev, P (Siyushev, Petr); Metsch, MH (Metsch, Mathias H.); Jelezko, F (Jelezko, Fedor); Hatano, M (Hatano, Mutsuko) |
| Title: Tin-Vacancy Quantum Emitters in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 119 |
| Issue: 25 |
| Article Number: 253601 |
| DOI: 10.1103/PhysRevLett.119.253601 |
| Published: DEC 22 2017 |
| Abstract: Tin-vacancy (Sn-V) color centers were created in diamond via ion implantation and subsequent high-temperature annealing up to 2100 degrees C at 7.7 GPa. The first-principles calculation suggested that a large atom of tin can be incorporated into a diamond lattice with a split-vacancy configuration, in which a tin atom sits on an interstitial site with two neighboring vacancies. The Sn-V center showed a sharp zero phonon line at 619 nm at room temperature. This line split into four peaks at cryogenic temperatures, with a larger ground state splitting (similar to 850 GHz) than that of color centers based on other group-IV elements, i.e., silicon-vacancy (Si-V) and germanium-vacancy (Ge-V) centers. The excited state lifetime was estimated, via Hanbury Brown-Twiss interferometry measurements on single Sn-V quantum emitters, to be similar to 5 ns. The order of the experimentally obtained optical transition energies, compared with those of Si-V and Ge-V centers, was in good agreement with the theoretical calculations. |
| Accession Number: WOS:000418619100006 |
| PubMed ID: 29303349 |
| Record 104 of 225 |
| By: Frank, F (Frank, Florian); Unden, T (Unden, Thomas); Zoller, J (Zoller, Jonathan); Said, RS (Said, Ressa S.); Calarco, T (Calarco, Tommaso); Montangero, S (Montangero, Simone); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Autonomous calibration of single spin qubit operations |
| Source: NPJ QUANTUM INFORMATION |
| Volume: 3 |
| Article Number: 48 |
| DOI: 10.1038/s41534-017-0049-8 |
| Published: DEC 1 2017 |
| Abstract: Fully autonomous precise control of qubits is crucial for quantum information processing, quantum communication, and quantum sensing applications. It requires minimal human intervention on the ability to model, to predict, and to anticipate the quantum dynamics, as well as to precisely control and calibrate single qubit operations. Here, we demonstrate single qubit autonomous calibrations via closed-loop optimisations of electron spin quantum operations in diamond. The operations are examined by quantum state and process tomographic measurements at room temperature, and their performances against systematic errors are iteratively rectified by an optimal pulse engineering algorithm. We achieve an autonomous calibrated fidelity up to 1.00 on a time scale of minutes for a spin population inversion and up to 0.98 on a time scale of hours for a single qubit pi/2 rotation within the experimental error of 2%. These results manifest a full potential for versatile quantum technologies. |
| Accession Number: WOS:000417208100001 |
| Record 105 of 225 |
| By: Sukachev, DD (Sukachev, D. D.); Sipahigil, A (Sipahigil, A.); Nguyen, CT (Nguyen, C. T.); Bhaskar, MK (Bhaskar, M. K.); Evans, RE (Evans, R. E.); Jelezko, F (Jelezko, F.); Lukin, MD (Lukin, M. D.) |
| Title: Silicon-Vacancy Spin Qubit in Diamond: A Quantum Memory Exceeding 10 ms with Single-Shot State Readout |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 119 |
| Issue: 22 |
| Article Number: 223602 |
| DOI: 10.1103/PhysRevLett.119.223602 |
| Published: NOV 29 2017 |
| Abstract: The negatively charged silicon-vacancy (SiV-) color center in diamond has recently emerged as a promising system for quantum photonics. Its symmetry-protected optical transitions enable the creation of indistinguishable emitter arrays and deterministic coupling to nanophotonic devices. Despite this, the longest coherence time associated with its electronic spin achieved to date (similar to 250 ns) has been limited by coupling to acoustic phonons. We demonstrate coherent control and suppression of phonon-induced dephasing of the SiV- electronic spin coherence by 5 orders of magnitude by operating at temperatures below 500 mK. By aligning the magnetic field along the SiV- symmetry axis, we demonstrate spinconserving optical transitions and single-shot readout of the SiV- spin with 89% fidelity. Coherent control of the SiV- spin with microwave fields is used to demonstrate a spin coherence time T-2 of 13 ms and a spin relaxation time T-1 exceeding 1 s at 100 mK. These results establish the SiV- as a promising solid-state candidate for the realization of quantum networks. |
| Accession Number: WOS:000416433000013 |
| PubMed ID: 29286819 |
| Record 106 of 225 |
| By: Scheuer, J (Scheuer, Jochen); Schwartz, I (Schwartz, Ilai); Muller, S (Mueller, Samuel); Chen, Q (Chen, Qiong); Dhand, I (Dhand, Ish); Plenio, MB (Plenio, Martin B.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Robust techniques for polarization and detection of nuclear spin ensembles |
| Source: PHYSICAL REVIEW B |
| Volume: 96 |
| Issue: 17 |
| Article Number: 174436 |
| DOI: 10.1103/PhysRevB.96.174436 |
| Published: NOV 27 2017 |
| Abstract: Highly sensitive nuclear spin detection is crucial in many scientific areas including nuclear magnetic resonance spectroscopy, magnetic resonance imaging (MRI), and quantum computing. The tiny thermal nuclear spin polarization represents a major obstacle towards this goal which may be overcome by dynamic nuclear spin polarization (DNP) methods. The latter often rely on the transfer of the thermally polarized electron spins to nearby nuclear spins, which is limited by the Boltzmann distribution of the former. Here we utilize microwave dressed states to transfer the high (> 92%) nonequilibrium electron spin polarization of a single nitrogen-vacancy center (NV) induced by short laser pulses to the surrounding C-13 carbon nuclear spins. The NV is repeatedly repolarized optically, thus providing an effectively infinite polarization reservoir. A saturation of the polarization of the nearby nuclear spins is achieved, which is confirmed by the decay of the polarization transfer signal and shows an excellent agreement with theoretical simulations. Hereby we introduce the polarization readout by polarization inversion method as a quantitative magnetization measure of the nuclear spin bath, which allows us to observe by ensemble averaging macroscopically hidden polarization dynamics like Landau-Zener-Stockelberg oscillations. Moreover, we show that using the integrated solid effect both for single-and double-quantum transitions nuclear spin polarization can be achieved even when the static magnetic field is not aligned along the NV's crystal axis. This opens a path for the application of our DNP technique to spins in and outside of nanodiamonds, enabling their application as MRI tracers. Furthermore, the methods reported here can be applied to other solid state systems where a central electron spin is coupled to a nuclear spin bath, e.g., phosphor donors in silicon and color centers in silicon carbide. |
| Accession Number: WOS:000416233500010 |
| Record 107 of 225 |
| By: Shu, ZJ (Shu, Zijun); Zhang, ZD (Zhang, Zhendong); Cao, QY (Cao, Qingyun); Yang, PC (Yang, Pengcheng); Plenio, MB (Plenio, Martin B.); Muller, C (Mueller, Christoph); Lang, J (Lang, Johannes); Tomek, N (Tomek, Nikolas); Naydenov, B (Naydenov, Boris); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor); Cai, JM (Cai, Jianming) |
| Title: Unambiguous nuclear spin detection using an engineered quantum sensing sequence |
| Source: PHYSICAL REVIEW A |
| Volume: 96 |
| Issue: 5 |
| Article Number: 051402 |
| DOI: 10.1103/PhysRevA.96.051402 |
| Published: NOV 17 2017 |
| Abstract: Sensing, localizing, and identifying individual nuclear spins or frequency components of a signal in the presence of a noisy environment requires the development of robust and selective methods of dynamical decoupling. An important challenge that remains to be addressed in this context are spurious higher-order resonances in current dynamical decoupling sequences as they can lead to the misidentification of nuclei or of different frequency components of external signals. Here we overcome this challenge with engineered quantum sensing sequences that achieve both enhanced robustness and the simultaneous suppression of higher-order-harmonic resonances. We experimentally demonstrate the principle using a single nitrogen-vacancy center spin sensor which we apply to the unambiguous detection of external protons. |
| Accession Number: WOS:000415567100001 |
| Record 108 of 225 |
| By: Stark, A (Stark, Alexander); Aharon, N (Aharon, Nati); Unden, T (Unden, Thomas); Louzon, D (Louzon, Daniel); Huck, A (Huck, Alexander); Retzker, A (Retzker, Alex); Andersen, UL (Andersen, Ulrik L.); Jelezko, F (Jelezko, Fedor) |
| Title: Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling |
| Source: NATURE COMMUNICATIONS |
| Volume: 8 |
| Article Number: 1105 |
| DOI: 10.1038/s41467-017-01159-2 |
| Published: OCT 19 2017 |
| Abstract: State-of-the-art methods for sensing weak AC fields are only efficient in the low frequency domain (<10 MHz). The inefficiency of sensing high-frequency signals is due to the lack of ability to use dynamical decoupling. In this paper we show that dynamical decoupling can be incorporated into high-frequency sensing schemes and by this we demonstrate that the high sensitivity achieved for low frequency can be extended to the whole spectrum. While our scheme is general and suitable to a variety of atomic and solid-state systems, we experimentally demonstrate it with the nitrogen-vacancy center in diamond. For a diamond with natural abundance of C-13, we achieve coherence times up to 1.43 ms resulting in a smallest detectable magnetic field strength of 4 nT at 1.6 GHz. Attributed to the inherent nature of our scheme, we observe an additional increase in coherence time due to the signal itself. |
| Accession Number: WOS:000413197900001 |
| PubMed ID: 29051547 |
| Record 109 of 225 |
| By: Gefen, T (Gefen, Tuvia); Jelezko, F (Jelezko, Fedor); Retzker, A (Retzker, Alex) |
| Title: Control methods for improved Fisher information with quantum sensing |
| Source: PHYSICAL REVIEW A |
| Volume: 96 |
| Issue: 3 |
| Article Number: 032310 |
| DOI: 10.1103/PhysRevA.96.032310 |
| Published: SEP 8 2017 |
| Abstract: Recently new approaches for sensing the frequency of time dependent Hamiltonians have been presented, and it was shown that the optimal Fisher information scales as T-4. We present here our interpretation of this new scaling, where the relative phase is accumulated quadratically with time, and show that this can be produced by a variety of simple pulse sequences. Interestingly, this scaling has a limited duration, and we show that certain pulse sequences prolong the effect. The performance of these schemes is analyzed and we examine their relevance to state-of-the-art experiments. We analyze the T-3 scaling of the Fisher information which appears when multiple synchronized measurements are performed, and is the optimal scaling in the case of a finite coherence time. |
| Accession Number: WOS:000409999500002 |
| Record 110 of 225 |
| By: Siyushev, P (Siyushev, Petr); Metsch, MH (Metsch, Mathias H.); Ijaz, A (Ijaz, Aroosa); Binder, JM (Binder, Jan M.); Bhaskar, MK (Bhaskar, Mihir K.); Sukachev, DD (Sukachev, Denis D.); Sipahigil, A (Sipahigil, Alp); Evans, RE (Evans, Ruffin E.); Nguyen, CT (Nguyen, Christian T.); Lukin, MD (Lukin, Mikhail D.); Hemmer, PR (Hemmer, Philip R.); Palyanov, YN (Palyanov, Yuri N.); Kupriyanov, IN (Kupriyanov, Igor N.); Borzdov, YM (Borzdov, Yuri M.); Rogers, LJ (Rogers, Lachlan J.); Jelezko, F (Jelezko, Fedor) |
| Title: Optical and microwave control of germanium-vacancy center spins in diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 96 |
| Issue: 8 |
| Article Number: 081201 |
| DOI: 10.1103/PhysRevB.96.081201 |
| Published: AUG 18 2017 |
| Abstract: A solid-state system combining a stable spin degree of freedom with an efficient optical interface is highly desirable as an element for integrated quantum-optical and quantum-information systems. We demonstrate a bright color center in diamond with excellent optical properties and controllable electronic spin states. Specifically, we carry out detailed optical spectroscopy of a germanium-vacancy (GeV) color center demonstrating optical spectral stability. Using an external magnetic field to lift the electronic spin degeneracy, we explore the spin degree of freedom as a controllable qubit. Spin polarization is achieved using optical pumping, and a spin relaxation time in excess of 20 mu s is demonstrated. We report resonant microwave control of spin transitions, and use this as a probe to measure the Autler-Townes effect in a microwave-optical double-resonance experiment. Superposition spin states were prepared using coherent population trapping, and a pure dephasing time of about 19 ns was observed at a temperature of 2.0 K. |
| Accession Number: WOS:000407927500002 |
| Record 111 of 225 |
| By: Haussler, S (Haeussler, Stefan); Thiering, G (Thiering, Gergo); Dietrich, A (Dietrich, Andreas); Waasem, N (Waasem, Niklas); Teraji, T (Teraji, Tokuyuki); Isoya, J (Isoya, Junichi); Iwasaki, T (Iwasaki, Takayuki); Hatano, M (Hatano, Mutsuko); Jelezko, F (Jelezko, Fedor); Gali, A (Gali, Adam); Kubanek, A (Kubanek, Alexander) |
| Title: Photoluminescence excitation spectroscopy of SiV- and GeV- color center in diamond |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 19 |
| Article Number: 063036 |
| DOI: 10.1088/1367-2630/aa73e5 |
| Published: JUL 3 2017 |
| Abstract: Color centers in diamond are important quantum emitters for a broad range of applications ranging from quantum sensing to quantum optics. Understanding the internal energy level structure is of fundamental importance for future applications. We experimentally investigate the level structure of an ensemble of few negatively charged silicon-vacancy (SiV-) and germanium-vacancy (GeV-) centers in bulk diamond at room temperature by photoluminescence (PL) and excitation (PLE) spectroscopy over a broad wavelength range from 460 to 650 nm and perform power-dependent saturation measurements. For SiV- our experimental results confirm the presence of a higher energy transition at similar to 2.31 eV. By comparison with detailed theoretical simulations of the imaginary dielectric function we interpret the transition as a dipole-allowed transition from E-2(g)-state to (2)A(2u)-state where the corresponding a(2u)-level lies deeply inside the diamond valence band. Therefore, the transition is broadened by the diamond band. At higher excitation power of 10 mW we indicate signs of a parity-conserving transition at similar to 2.03 eV supported by saturation measurements. For GeV- we demonstrate that the PLE spectrum is in good agreement with the mirror image of the PL spectrum of the zero-phonon line. Experimentally we do not observe a higher lying energy level up to a transition wavelength of 460 nm. The observed PL spectra are identical, independent of excitation wavelength, suggesting a rapid decay to E-2(u) excited state and followed by optical transition to E-2(g) ground state. Our investigations convey important insights for future quantum optics and quantum sensing experiments based on SiV- -center and GeV--center in diamond. |
| Accession Number: WOS:000404638300004 |
| Record 112 of 225 |
| By: Kern, M (Kern, M.); Jeske, J (Jeske, J.); Lau, DWM (Lau, D. W. M.); Greentree, AD (Greentree, A. D.); Jelezko, F (Jelezko, F.); Twamley, J (Twamley, J.) |
| Title: Optical cryocooling of diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 95 |
| Issue: 23 |
| Article Number: 235306 |
| DOI: 10.1103/PhysRevB.95.235306 |
| Published: JUN 21 2017 |
| Abstract: The cooling of solids by optical means only using anti-Stokes emission has a long history of research and achievements. Such cooling methods have many advantages ranging from no moving parts or fluids through to operation in vacuum and may have applications to cryosurgery. However, achieving large optical cryocooling powers has been difficult to manage except in certain rare-earth crystals but these are mostly toxic and not biocompatible. Through study of the emission and absorption cross sections we find that diamond, containing either nitrogen vacancy (NV) or silicon vacancy defects, shows potential for optical cryocooling and, in particular, NV doping shows promise for optical refrigeration. We study the optical cooling of doped diamond microcrystals ranging 10-250 mu m in diameter trapped either in vacuum or in water. For the vacuum case we find NV-doped microdiamond optical cooling below room temperature could exceed |Delta T| > 10 K for irradiation powers of P-in < 100 mW. We predict that such temperature changes should be easily observed via large alterations in the diffusion constant for optically cryocooled microdiamonds trapped in water in an optical tweezer or via spectroscopic signatures such as the zero-phonon line width or Raman line. |
| Accession Number: WOS:000404018100003 |
| Record 113 of 225 |
| By: Gulka, M (Gulka, Michal); Bourgeois, E (Bourgeois, Emilie); Hruby, J (Hruby, Jaroslav); Siyushev, P (Siyushev, Petr); Wachter, G (Wachter, Georg); Aumayr, F (Aumayr, Friedrich); Hemmer, PR (Hemmer, Philip R.); Gali, A (Gali, Adam); Jelezko, F (Jelezko, Fedor); Trupke, M (Trupke, Michael); Nesladek, M (Nesladek, Milos) |
| Title: Pulsed Photoelectric Coherent Manipulation and Detection of N-V Center Spins In Diamond (vol 7, 044032, 2017) |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 7 |
| Issue: 6 |
| Article Number: 069901 |
| DOI: 10.1103/PhysRevApplied.7.069901 |
| Published: JUN 20 2017 |
| Accession Number: WOS:000404033900001 |
| Record 114 of 225 |
| By: Bhaskar, MK (Bhaskar, M. K.); Sukachev, DD (Sukachev, D. D.); Sipahigil, A (Sipahigil, A.); Evans, RE (Evans, R. E.); Burek, MJ (Burek, M. J.); Nguyen, CT (Nguyen, C. T.); Rogers, LJ (Rogers, L. J.); Siyushev, P (Siyushev, P.); Metsch, MH (Metsch, M. H.); Park, H (Park, H.); Jelezko, F (Jelezko, F.); Loncar, M (Loncar, M.); Lukin, MD (Lukin, M. D.) |
| Title: Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 118 |
| Issue: 22 |
| Article Number: 223603 |
| DOI: 10.1103/PhysRevLett.118.223603 |
| Published: MAY 31 2017 |
| Abstract: We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV center without the use of a cavity or slow-light waveguide. As a result, a single GeV center reduces waveguide transmission by 18 +/- 1% on resonance in a single pass. We use a nanophotonic interferometer to perform homodyne detection of GeV resonance fluorescence. By probing the photon statistics of the output field, we demonstrate that the GeV-waveguide system is nonlinear at the single-photon level. |
| Accession Number: WOS:000404624800006 |
| PubMed ID: 28621982 |
| Record 115 of 225 |
| By: Schmitt, S (Schmitt, Simon); Gefen, T (Gefen, Tuvia); Sturner, FM (Stuerner, Felix M.); Unden, T (Unden, Thomas); Wolff, G (Wolff, Gerhard); Muller, C (Mueller, Christoph); Scheuer, J (Scheuer, Jochen); Naydenov, B (Naydenov, Boris); Markham, M (Markham, Matthew); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Schwarz, I (Schwarz, Ilai); Plenio, MB (Plenio, Martin B.); Retzker, A (Retzker, Alex); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor |
| Source: SCIENCE |
| Volume: 356 |
| Issue: 6340 |
| Pages: 832-836 |
| DOI: 10.1126/science.aam5532 |
| Published: MAY 26 2017 |
| Abstract: Precise timekeeping is critical to metrology, forming the basis by which standards of time, length, and fundamental constants are determined. Stable clocks are particularly valuable in spectroscopy because they define the ultimate frequency precision that can be reached. In quantum metrology, the qubit coherence time defines the clock stability, from which the spectral linewidth and frequency precision are determined. We demonstrate a quantum sensing protocol in which the spectral precision goes beyond the sensor coherence time and is limited by the stability of a classical clock. Using this technique, we observed a precision in frequency estimation scaling in time T as T-3/2 for classical oscillating fields. The narrow linewidth magnetometer based on single spins in diamond is used to sense nanoscale magnetic fields with an intrinsic frequency resolution of 607 microhertz, which is eight orders of magnitude narrower than the qubit coherence time. |
| Accession Number: WOS:000401957900035 |
| PubMed ID: 28546208 |
| Record 116 of 225 |
| By: Gulka, M (Gulka, Michal); Bourgeois, E (Bourgeois, Emilie); Hruby, J (Hruby, Jaroslav); Siyushev, P (Siyushev, Petr); Wachter, G (Wachter, Georg); Aumayr, F (Aumayr, Friedrich); Hemmer, PR (Hemmer, Philip R.); Gali, A (Gali, Adam); Jelezko, F (Jelezko, Fedor); Trupke, M (Trupke, Michael); Nesladek, M (Nesladek, Milos) |
| Title: Pulsed Photoelectric Coherent Manipulation and Detection of N-V Center Spins in Diamond |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 7 |
| Issue: 4 |
| Article Number: 044032 |
| DOI: 10.1103/PhysRevApplied.7.044032 |
| Published: APR 28 2017 |
| Abstract: We demonstrate hybrid photoelectric pulse protocols for reading the spin states of nitrogen-vacancy (N-V) centers in diamond, compatible with coherent spin control and performed on shallow nitrogen-implanted electronic grade diamond. The measurements are carried out on spin ensembles from 1000 to just five N-V centers as a first step towards the fabrication of scalable photoelectric quantum chips. Specific microwave protocols are developed that suppress background photocurrent related to ionization of N-S(0) defects and provide a high contrast and SNR. The technique is demonstrated on Rabi and Ramsey sequences. |
| Accession Number: WOS:000400248800004 |
| Record 117 of 225 |
| By: Aharonovich, I (Aharonovich, Igor); Jelezko, F (Jelezko, Fedor) |
| Title: SPECTROSCOPY Mapping spins in flatland |
| Source: NATURE MATERIALS |
| Volume: 16 |
| Issue: 4 |
| Pages: 397-398 |
| DOI: 10.1038/nmat4881 |
| Published: APR 2017 |
| Accession Number: WOS:000397600500006 |
| PubMed ID: 28352094 |
| Record 118 of 225 |
| By: Choi, S (Choi, Soonwon); Choi, J (Choi, Joonhee); Landig, R (Landig, Renate); Kucsko, G (Kucsko, Georg); Zhou, HY (Zhou, Hengyun); Isoya, J (Isoya, Junichi); Jelezko, F (Jelezko, Fedor); Onoda, S (Onoda, Shinobu); Sumiya, H (Sumiya, Hitoshi); Khemani, V (Khemani, Vedika); von Keyserlingk, C (von Keyserlingk, Curt); Yao, NY (Yao, Norman Y.); Demler, E (Demler, Eugene); Lukin, MD (Lukin, Mikhail D.) |
| Title: Observation of discrete time-crystalline order in a disordered dipolar many-body system |
| Source: NATURE |
| Volume: 543 |
| Issue: 7644 |
| Pages: 221-+ |
| DOI: 10.1038/nature21426 |
| Published: MAR 9 2017 |
| Abstract: Understanding quantum dynamics away from equilibrium is an outstanding challenge in the modern physical sciences. Out-of-equilibrium systems can display a rich variety of phenomena, including self-organized synchronization and dynamical phase transitions(1,2). More recently, advances in the controlled manipulation of isolated many-body systems have enabled detailed studies of non-equilibrium phases in strongly interacting quantum matter(3-6); for example, the interplay between periodic driving, disorder and strong interactions has been predicted to result in exotic 'time-crystalline' phases(7), in which a system exhibits temporal correlations at integer multiples of the fundamental driving period, breaking the discrete time-translational symmetry of the underlying drive(8-12). Here we report the experimental observation of such discrete time-crystalline order in a driven, disordered ensemble of about one million dipolar spin impurities in diamond at room temperature(13-15). We observe long-lived temporal correlations, experimentally identify the phase boundary and find that the temporal order is protected by strong interactions. This order is remarkably stable to perturbations, even in the presence of slow thermalization(16,17). Our work opens the door to exploring dynamical phases of matter and controlling interacting, disordered many-body systems(18-20). |
| Accession Number: WOS:000395688700034 |
| PubMed ID: 28277511 |
| Record 119 of 225 |
| By: Choi, J (Choi, Joonhee); Choi, S (Choi, Soonwon); Kucsko, G (Kucsko, Georg); Maurer, PC (Maurer, Peter C.); Shields, BJ (Shields, Brendan J.); Sumiya, H (Sumiya, Hitoshi); Onoda, S (Onoda, Shinobu); Isoya, J (Isoya, Junichi); Demler, E (Demler, Eugene); Jelezko, F (Jelezko, Fedor); Yao, NY (Yao, Norman Y.); Lukin, MD (Lukin, Mikhail D.) |
| Title: Depolarization Dynamics in a Strongly Interacting Solid-State Spin Ensemble |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 118 |
| Issue: 9 |
| Article Number: 093601 |
| DOI: 10.1103/PhysRevLett.118.093601 |
| Published: MAR 3 2017 |
| Abstract: We study the depolarization dynamics of a dense ensemble of dipolar interacting spins, associated with nitrogen-vacancy centers in diamond. We observe anomalously fast, density-dependent, and nonexponential spin relaxation. To explain these observations, we propose a microscopic model where an interplay of long-range interactions, disorder, and dissipation leads to predictions that are in quantitative agreement with both current and prior experimental results. Our results pave the way for controlled many-body experiments with long-lived and strongly interacting ensembles of solid-state spins. |
| Accession Number: WOS:000396045900008 |
| PubMed ID: 28306313 |
| Record 120 of 225 |
| By: Barson, MSJ (Barson, Michael S. J.); Peddibhotla, P (Peddibhotla, Phani); Ovartchaiyapong, P (Ovartchaiyapong, Preeti); Ganesan, K (Ganesan, Kumaravelu); Taylor, RL (Taylor, Richard L.); Gebert, M (Gebert, Matthew); Mielens, Z (Mielens, Zoe); Koslowski, B (Koslowski, Berndt); Simpson, DA (Simpson, David A.); McGuinness, LP (McGuinness, Liam P.); McCallum, J (McCallum, Jeffrey); Prawer, S (Prawer, Steven); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); Jayich, ACB (Jayich, Ania C. Bleszynski); Jelezko, F (Jelezko, Fedor); Manson, NB (Manson, Neil B.); Doherty, MW (Doherty, Marcus W.) |
| Title: Nanomechanical Sensing Using Spins in Diamond |
| Source: NANO LETTERS |
| Volume: 17 |
| Issue: 3 |
| Pages: 1496-1503 |
| DOI: 10.1021/acs.nanolett.6b04544 |
| Published: MAR 2017 |
| Abstract: Nanomechanical sensors and quantum nanosensors are two rapidly developing technologies that have diverse interdisciplinary applications in biological and chemical analysis and microscopy. For example, nano mechanical sensors based upon nanoelectromechanical systems (NEMS) have demonstrated chip-scale mass spectrometry capable of detecting single macromolecules, such as proteins. Quantum nanosensors based upon electron spins of negatively charged nitrogen-vacancy (NV) centers in diamond have demonstrated diverse modes of nanometrology, including single molecule magnetic resonance spectroscopy. Here, we report the first step toward combining these two complementary technologies in the form of diamond nanomechanical structures containing NV centers. We establish the principles for nanomechanical sensing using such nanospin-mechanical sensors (NSMS) and assess their potential for mass spectrometry and force microscopy. We predict that NSMS are able to provide unprecedented AC force images of cellular biomechanics and to not only detect the mass of a single macromolecule but also image its distribution. When combined with the other nanometrology modes of the NV center, NSMS potentially offer unparalleled analytical power at the nanoscale. |
| Accession Number: WOS:000396185800026 |
| PubMed ID: 28146361 |
| Record 121 of 225 |
| By: Suter, D (Suter, Dieter); Jelezko, F (Jelezko, Fedor) |
| Title: Single-spin magnetic resonance in the nitrogen-vacancy center of diamond |
| Source: PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY |
| Volume: 98-99 |
| Pages: 50-62 |
| DOI: 10.1016/j.pnmrs.2016.12.001 |
| Published: FEB 2017 |
| Abstract: Magnetic resonance of single spins has flourished mostly because of the unique properties of the NV center in diamond. This review covers the basic physics of this defect center, introduces the techniques for working with single spins and gives an overview of some applications like quantum information and sensing. (C) 2016 Elsevier B.V. All rights reserved. |
| Accession Number: WOS:000396958200003 |
| PubMed ID: 28283086 |
| Record 122 of 225 |
| By: Jeske, J (Jeske, Jan); Lau, DWM (Lau, Desmond W. M.); Vidal, X (Vidal, Xavier); McGuinness, LP (McGuinness, Liam P.); Reineck, P (Reineck, Philipp); Johnson, BC (Johnson, Brett C.); Doherty, MW (Doherty, Marcus W.); McCallum, JC (McCallum, Jeffrey C.); Onoda, S (Onoda, Shinobu); Jelezko, F (Jelezko, Fedor); Ohshima, T (Ohshima, Takeshi); Volz, T (Volz, Thomas); Cole, JH (Cole, Jared H.); Gibson, BC (Gibson, Brant C.); Greentree, AD (Greentree, Andrew D.) |
| Title: Stimulated emission from nitrogen-vacancy centres in diamond |
| Source: NATURE COMMUNICATIONS |
| Volume: 8 |
| Article Number: 14000 |
| DOI: 10.1038/ncomms14000 |
| Published: JAN 27 2017 |
| Abstract: Stimulated emission is the process fundamental to laser operation, thereby producing coherent photon output. Despite negatively charged nitrogen-vacancy (NV-) centres being discussed as a potential laser medium since the 1980s, there have been no definitive observations of stimulated emission from ensembles of NV- to date. Here we show both theoretical and experimental evidence for stimulated emission from NV- using light in the phonon sidebands around 700 nm. Furthermore, we show the transition from stimulated emission to photoionization as the stimulating laser wavelength is reduced from 700 to 620 nm. While lasing at the zero-phonon line is suppressed by ionization, our results open the possibility of diamond lasers based on NV- centres, tuneable over the phonon sideband. This broadens the applications of NV- magnetometers from single centre nanoscale sensors to a new generation of ultra-precise ensemble laser sensors, which exploit the contrast and signal amplification of a lasing system. |
| Accession Number: WOS:000392741300001 |
| PubMed ID: 28128228 |
| Record 123 of 225 |
| By: Binder, JM (Binder, Jan M.); Stark, A (Stark, Alexander); Tomek, N (Tomek, Nikolas); Scheuer, J (Scheuer, Jochen); Frank, F (Frank, Florian); Jahnke, KD (Jahnke, Kay D.); Muller, C (Mueller, Christoph); Schmitt, S (Schmitt, Simon); Metsch, MH (Metsch, Mathias H.); Unden, T (Unden, Thomas); Gehring, T (Gehring, Tobias); Huck, A (Huck, Alexander); Andersen, UL (Andersen, Ulrik L.); Rogers, LJ (Rogers, Lachlan J.); Jelezko, F (Jelezko, Fedor) |
| Title: Qudi: A modular python suite for experiment control and data processing |
| Source: SOFTWAREX |
| Volume: 6 |
| Pages: 85-90 |
| DOI: 10.1016/j.softx.2017.02.001 |
| Published: 2017 |
| Abstract: Qudi is a general, modular, multi-operating system suite written in Python 3 for controlling laboratory experiments. It provides a structured environment by separating functionality into hardware abstraction, experiment logic and user interface layers. The core feature set comprises a graphical user interface, live data visualization, distributed execution over networks, rapid prototyping via Jupyter notebooks, configuration management, and data recording. Currently, the included modules are focused on confocal microscopy, quantum optics and quantum information experiments, but an expansion into other fields is possible and encouraged. (C) 2017 The Authors. Published by Elsevier B.V. |
| Accession Number: WOS:000457135200014 |
| Record 124 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Basic Concepts of Electron Paramagnetic Resonance |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 1-111 |
| DOI: 10.1007/978-3-7091-1157-4_1 |
| Published: 2017 |
| Accession Number: WOS:000419701300002 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 125 of 225 |
| By: Baranov, PG (Baranov, PG); VonBardeleben, HJ (VonBardeleben, HJ); Jelezko, F (Jelezko, F); Wrachtrup, J (Wrachtrup, J) |
| Title: Magnetic Resonance of Semiconductors and Their Nanostructures: Basic and Advanced Applications |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 1-524 |
| DOI: 10.1007/978-3-7091-1157-4 |
| Published: 2017 |
| Accession Number: WOS:000419701300008 |
| Record 126 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Fundamentals of EPR Related Methods |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 113-178 |
| DOI: 10.1007/978-3-7091-1157-4_2 |
| Published: 2017 |
| Accession Number: WOS:000419701300003 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 127 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Retrospectives: Magnetic Resonance Studies of Intrinsic Defects in Semiconductors |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 179-211 |
| DOI: 10.1007/978-3-7091-1157-4_3 |
| Published: 2017 |
| Accession Number: WOS:000419701300004 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 128 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: State-of-Art: High-Frequency EPR, ESE, ENDOR and ODMR in Wide-Band-Gap Semiconductors |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 213-355 |
| DOI: 10.1007/978-3-7091-1157-4_4 |
| Published: 2017 |
| Accession Number: WOS:000419701300005 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 129 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Magnetic Resonance in Semiconductor Micro- and Nanostructures |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 357-433 |
| DOI: 10.1007/978-3-7091-1157-4_5 |
| Published: 2017 |
| Accession Number: WOS:000419701300006 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 130 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Perspectives of Applications of Magnetic Properties of Semiconductor Nanostructures and Single Defects |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: 435-518 |
| DOI: 10.1007/978-3-7091-1157-4_6 |
| Published: 2017 |
| Accession Number: WOS:000419701300007 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 131 of 225 |
| By: Baranov, PG (Baranov, Pavel G.); von Bardeleben, HJ (von Bardeleben, Hans Jurgen); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Book Author(s): Baranov, PG; VonBardeleben, HJ; Jelezko, F; Wrachtrup, J |
| Title: Magnetic Resonance of Semiconductors and Their Nanostructures Basic and Advanced Applications Springer Series in Materials Science Volume 253 Preface |
| Source: MAGNETIC RESONANCE OF SEMICONDUCTORS AND THEIR NANOSTRUCTURES: BASIC AND ADVANCED APPLICATIONS |
| Book Series Title: Springer Series in Materials Science |
| Volume: 253 |
| Pages: V-IX |
| Published: 2017 |
| Accession Number: WOS:000419701300001 |
| Book DOI: 10.1007/978-3-7091-1157-4 |
| Record 132 of 225 |
| By: Aharon, N (Aharon, N.); Cohen, I (Cohen, I.); Jelezko, F (Jelezko, F.); Retzker, A (Retzker, A.) |
| Title: Fully robust qubit in atomic and molecular three-level systems |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 18 |
| Article Number: 123012 |
| DOI: 10.1088/1367-2630/aa4fd3 |
| Published: DEC 12 2016 |
| Abstract: We present a new method of constructing a fully robust qubit in a three-level system. By the application of continuous driving fields, robustness to both external and controller noise is achieved. Specifically, magnetic noise and power fluctuations do not operate within the robust qubit subspace. Whereas all the continuous driving based constructions of such a fully robust qubit considered so far have required at least four levels, we show that in fact only three levels are necessary. This paves the way for simple constructions of a fully robust qubit in many atomic and solid state systems that are controlled by either microwave or optical fields. We focus on the NV-center in diamond and analyze the implementation of the scheme, by utilizing the electronic spin sub-levels of its ground state. In current state-of-the-art experimental setups the scheme leads to improvement of more than two orders of magnitude in coherence time, pushing it towards the lifetime limit. We show how the fully robust qubit can be used to implement quantum sensing, and in particular, the sensing of high frequency signals. |
| Accession Number: WOS:000390781100001 |
| Record 133 of 225 |
| By: Radko, IP (Radko, Ilya P.); Boll, M (Boll, Mads); Israelsen, NM (Israelsen, Niels M.); Raatz, N (Raatz, Nicole); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Andersen, UL (Andersen, Ulrik L.); Huck, A (Huck, Alexander) |
| Title: Determining the internal quantum efficiency of shallow-implanted nitrogen-vacancy defects in bulk diamond |
| Source: OPTICS EXPRESS |
| Volume: 24 |
| Issue: 24 |
| Pages: 27715-27725 |
| DOI: 10.1364/OE.24.027715 |
| Published: NOV 28 2016 |
| Abstract: It is generally accepted that nitrogen-vacancy (NV) defects in bulk diamond are bright sources of luminescence. However, the exact value of their internal quantum efficiency (IQE) has not been measured so far. Here we use an implementation of Drexhage's scheme to quantify the IQE of shallow-implanted NV defects in a single-crystal bulk diamond. Using a spherical metallic mirror with a large radius of curvature compared to the optical spot size, we perform calibrated modifications of the local density of states around NV defects and observe the change of their total decay rate, which is further used for IQE quantification. We also show that at the excitation wavelength of 532 nm, photo-induced relaxation cannot be neglected even at moderate excitation powers well below the saturation level. For NV defects shallow implanted 4.5 +/- 1 and 8 +/- 2 nm below the diamond surface, we determine the quantum efficiency to be 0.70 +/- 0.07 and 0.82 +/- 0.08, respectively. (C) 2016 Optical Society of America |
| Accession Number: WOS:000389468200061 |
| PubMed ID: 27906340 |
| Record 134 of 225 |
| By: Sipahigil, A (Sipahigil, A.); Evans, RE (Evans, R. E.); Sukachev, DD (Sukachev, D. D.); Burek, MJ (Burek, M. J.); Borregaard, J (Borregaard, J.); Bhaskar, MK (Bhaskar, M. K.); Nguyen, CT (Nguyen, C. T.); Pacheco, JL (Pacheco, J. L.); Atikian, HA (Atikian, H. A.); Meuwly, C (Meuwly, C.); Camacho, RM (Camacho, R. M.); Jelezko, F (Jelezko, F.); Bielejec, E (Bielejec, E.); Park, H (Park, H.); Loncar, M (Loncar, M.); Lukin, MD (Lukin, M. D.) |
| Title: An integrated diamond nanophotonics platform for quantum-optical networks |
| Source: SCIENCE |
| Volume: 354 |
| Issue: 6314 |
| Pages: 847-850 |
| DOI: 10.1126/science.aah6875 |
| Published: NOV 18 2016 |
| Abstract: Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable optical nonlinearities at the single-photon level. We demonstrate an integrated platform for scalable quantum nanophotonics based on silicon-vacancy (SiV) color centers coupled to diamond nanodevices. By placing SiV centers inside diamond photonic crystal cavities, we realize a quantum-optical switch controlled by a single color center. We control the switch using SiV metastable states and observe optical switching at the singlephoton level. Raman transitions are used to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide. By measuring intensity correlations of indistinguishable Raman photons emitted into a single waveguide, we observe a quantum interference effect resulting from the superradiant emission of two entangled SiV centers. |
| Accession Number: WOS:000388531900031 |
| PubMed ID: 27738014 |
| Record 135 of 225 |
| By: Liu, WN (Liu, Weina); Naydenov, B (Naydenov, Boris); Chakrabortty, S (Chakrabortty, Sabyasachi); Wuensch, B (Wuensch, Bettina); Hubner, K (Huebner, Kristina); Ritz, S (Ritz, Sandra); Colfen, H (Coelfen, Helmut); Barth, H (Barth, Holger); Koynov, K (Koynov, Kaloian); Qi, HY (Qi, Haoyuan); Leiter, R (Leiter, Robert); Reuter, R (Reuter, Rolf); Wrachtrup, J (Wrachtrup, Joerg); Boldt, F (Boldt, Felix); Scheuer, J (Scheuer, Jonas); Kaiser, U (Kaiser, Ute); Sison, M (Sison, Miguel); Lasser, T (Lasser, Theo); Tinnefeld, P (Tinnefeld, Philip); Jelezko, F (Jelezko, Fedor); Walther, P (Walther, Paul); Wu, YZ (Wu, Yuzhou); Weil, T (Weil, Tanja) |
| Title: Fluorescent Nanodiamond-Gold Hybrid Particles for Multimodal Optical and Electron Microscopy Cellular Imaging |
| Source: NANO LETTERS |
| Volume: 16 |
| Issue: 10 |
| Pages: 6236-6244 |
| DOI: 10.1021/acs.nanolett.6b02456 |
| Published: OCT 2016 |
| Abstract: There is a continuous demand for imaging probes offering excellent performance in various microscopy techniques for comprehensive investigations. of cellular processes by more than, one technique. FluoreScent nanodianiond gold nanoparticles (END Au) constitute a new class of "all in -one" hybrid particles providing.unique features fOr multimodal imaging including optical imaging, eleCtron microscopy, and, and potentially even quantum, sensing. COnfocal and optical coherence microscopy of the END Au allow fast investigations inside living cells via emission, scattering, and photothermal imaging techniques because, the END 'emission is not quenched by AuNPs. In electron microscopy, transmission electron microscopy (TEM) and. scanning transmission electron microscopy (STEM) analysis of END Au reveals greatly enhanced contrast due to the gold particles as well as an extraordinary flickering behavior in three-diniensional Cellular environments originating from the nanodiamonds. The unique multimodal imaging characteristics of END Au enable detailed studies inside cells ranging from statistical distributions at the entire cellular level (micrometers) down to the tracking of individual particles in sub cellular organelles (nanometers). Herein, the processes of endosomal membrane uptake and release of FNDs were elucidated for the first time by the imaging of individual END Au hybrid nanoparticles with single-particle resolution. Their convenient preparation, the availability of various surface groups, their flexible detection modalities, and their single-particle contrast in combination with the capability for endosomal penetration and low cytotoxicity make FND Au unique candidates for multimodal optical electronic imaging applications with great potential for emerging techniques, such as quantum sensing inside living cells. |
| Accession Number: WOS:000385469800036 |
| PubMed ID: 27629492 |
| Record 136 of 225 |
| By: Jantzen, U (Jantzen, Uwe); Kurz, AB (Kurz, Andrea B.); Rudnicki, DS (Rudnicki, Daniel S.); Schafermeier, C (Schafermeier, Clemens); Jahnke, KD (Jahnke, Kay D.); Andersen, UL (Andersen, Ulrik L.); Davydov, VA (Davydov, Valery A.); Agafonov, VN (Agafonov, Viatcheslav N.); Kubanek, A (Kubanek, Alexander); Rogers, LJ (Rogers, Lachlan J.); Jelezko, F (Jelezko, Fedor) |
| Title: Nanodiamonds carrying silicon-vacancy quantum emitters with almost lifetime-limited linewidths |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 18 |
| Article Number: 073036 |
| DOI: 10.1088/1367-2630/18/7/073036 |
| Published: JUL 20 2016 |
| Abstract: Colour centres in nanodiamonds are an important resource for applications in quantum sensing, biological imaging, and quantum optics. Here we report unprecedented narrow optical transitions for individual colour centres in nanodiamonds smaller than 200 nm. This demonstration has been achieved using the negatively charged silicon vacancy centre, which has recently received considerable attention due to its superb optical properties in bulk diamond. We have measured an ensemble of silicon-vacancy centres across numerous nanodiamonds to have an inhomogeneous distribution of 1.05 nmat 5 K. Individual spectral lines as narrower than 360 MHz were measured in photoluminescence excitation, and correcting for apparent spectral diffusion yielded an homogeneous linewidth of about 200 MHz which is close to the lifetime limit. These results indicate the high crystalline quality achieved in these nanodiamond samples, and advance the applicability of nanodiamond-hosted colour centres for quantum optics applications. |
| Accession Number: WOS:000381879000001 |
| Record 137 of 225 |
| By: Unden, T (Unden, Thomas); Balasubramanian, P (Balasubramanian, Priya); Louzon, D (Louzon, Daniel); Vinkler, Y (Vinkler, Yuval); Plenio, MB (Plenio, Martin B.); Markham, M (Markham, Matthew); Twitchen, D (Twitchen, Daniel); Stacey, A (Stacey, Alastair); Lovchinsky, I (Lovchinsky, Igor); Sushkov, AO (Sushkov, Alexander O.); Lukin, MD (Lukin, Mikhail D.); Retzker, A (Retzker, Alex); Naydenov, B (Naydenov, Boris); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Quantum Metrology Enhanced by Repetitive Quantum Error Correction |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 116 |
| Issue: 23 |
| Article Number: 230502 |
| DOI: 10.1103/PhysRevLett.116.230502 |
| Published: JUN 9 2016 |
| Abstract: We experimentally demonstrate the protection of a room-temperature hybrid spin register against environmental decoherence by performing repeated quantum error correction whilst maintaining sensitivity to signal fields. We use a long-lived nuclear spin to correct multiple phase errors on a sensitive electron spin in diamond and realize magnetic field sensing beyond the time scales set by natural decoherence. The universal extension of sensing time, robust to noise at any frequency, demonstrates the definitive advantage entangled multiqubit systems provide for quantum sensing and offers an important complement to quantum control techniques. |
| Accession Number: WOS:000377509900002 |
| PubMed ID: 27341218 |
| Record 138 of 225 |
| By: Wu, YZ (Wu, Yuzhou); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.); Weil, T (Weil, Tanja) |
| Title: Diamond Quantum Devices in Biology |
| Source: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION |
| Volume: 55 |
| Issue: 23 |
| Pages: 6586-6598 |
| DOI: 10.1002/anie.201506556 |
| Published: JUN 1 2016 |
| Abstract: The currently available techniques for molecular imaging capable of reaching atomic resolution are limited to low temperatures, vacuum conditions, or large amounts of sample. Quantum sensors based on the spin-dependent photoluminescence of nitrogen-vacancy (NV) centers in diamond offer great potential to achieve single-molecule detection with atomic resolution under ambient conditions. Diamond nanoparticles could also be prepared with implanted NV centers, thereby generating unique nanosensors that are able to traffic into living biological systems. Therefore, this technique might provide unprecedented access and insight into the structure and function of individual biomolecules under physiological conditions as well as observation of biological processes down to the quantum level with atomic resolution. The theory of diamond quantum sensors and the current developments from their preparation to sensing techniques have been critically discussed in this Minireview. |
| Accession Number: WOS:000377921300003 |
| PubMed ID: 27120692 |
| Record 139 of 225 |
| By: Schleich, WP (Schleich, Wolfgang P.); Ranade, KS (Ranade, Kedar S.); Anton, C (Anton, Christian); Arndt, M (Arndt, Markus); Aspelmeyer, M (Aspelmeyer, Markus); Bayer, M (Bayer, Manfred); Berg, G (Berg, Gunnar); Calarco, T (Calarco, Tommaso); Fuchs, H (Fuchs, Harald); Giacobino, E (Giacobino, Elisabeth); Grassl, M (Grassl, Markus); Hanggi, P (Haenggi, Peter); Heckl, WM (Heckl, Wolfgang M.); Hertel, IV (Hertel, Ingolf-Volker); Huelga, S (Huelga, Susana); Jelezko, F (Jelezko, Fedor); Keimer, B (Keimer, Bernhard); Kotthaus, JP (Kotthaus, Joerg P.); Leuchs, G (Leuchs, Gerd); Lutkenhaus, N (Luetkenhaus, Norbert); Maurer, U (Maurer, Ueli); Pfau, T (Pfau, Tilman); Plenio, MB (Plenio, Martin B.); Rasel, EM (Rasel, Ernst Maria); Renn, O (Renn, Ortwin); Silberhorn, C (Silberhorn, Christine); Schiedmayer, J (Schiedmayer, Joerg); Schmitt-Landsiedel, D (Schmitt-Landsiedel, Doris); Schonhammer, K (Schoenhammer, Kurt); Ustinov, A (Ustinov, Alexey); Walther, P (Walther, Philip); Weinfurter, H (Weinfurter, Harald); Welzl, E (Welzl, Emo); Wiesendanger, R (Wiesendanger, Roland); Wolf, S (Wolf, Stefan); Zeilinger, A (Zeilinger, Anton); Zoller, P (Zoller, Peter) |
| Title: Quantum technology: from research to application |
| Source: APPLIED PHYSICS B-LASERS AND OPTICS |
| Volume: 122 |
| Issue: 5 |
| Article Number: 130 |
| DOI: 10.1007/s00340-016-6353-8 |
| Published: MAY 2016 |
| Abstract: The term quantum physics refers to the phenomena and characteristics of atomic and subatomic systems which cannot be explained by classical physics. Quantum physics has had a long tradition in Germany, going back nearly 100 years. Quantum physics is the foundation of many modern technologies. The first generation of quantum technology provides the basis for key areas such as semiconductor and laser technology. The "new" quantum technology, based on influencing individual quantum systems, has been the subject of research for about the last 20 years. Quantum technology has great economic potential due to its extensive research programs conducted in specialized quantum technology centres throughout the world. To be a viable and active participant in the economic potential of this field, the research infrastructure in Germany should be improved to facilitate more investigations in quantum technology research. |
| Accession Number: WOS:000378778600025 |
| Record 140 of 225 |
| By: Felgen, N (Felgen, Nina); Naydenov, B (Naydenov, Boris); Turner, S (Turner, Stuart); Jelezko, F (Jelezko, Fedor); Reithmaier, JP (Reithmaier, Johann Peter); Popov, C (Popov, Cyril) |
| Title: Incorporation and study of SiV centers in diamond nanopillars |
| Source: DIAMOND AND RELATED MATERIALS |
| Volume: 64 |
| Pages: 64-69 |
| DOI: 10.1016/j.diamond.2016.01.011 |
| Published: APR 2016 |
| Abstract: We report on the incorporation of SiV centers during hot filament chemical vapor deposition of diamond on top of diamond nanopillars with diameters down to 100 nm. The nanopillars themselves were prepared from nano crystalline diamond films by applying electron beam lithography and inductively coupled plasma reactive ion etching. The optical investigations revealed the presence of ensembles of SiV color centers incorporated during the overgrowth step. (C) 2016 Elsevier B.V. All rights reserved. |
| Accession Number: WOS:000374608100009 |
| Record 141 of 225 |
| By: de Oliveira, FF (de Oliveira, Felipe Favaro); Momenzadeh, SA (Momenzadeh, S. Ali); Antonov, D (Antonov, Denis); Scharpf, J (Scharpf, Jochen); Osterkamp, C (Osterkamp, Christian); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Denisenko, A (Denisenko, Andrej); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Toward Optimized Surface delta-Profiles of Nitrogen-Vacancy Centers Activated by Helium Irradiation in Diamond |
| Source: NANO LETTERS |
| Volume: 16 |
| Issue: 4 |
| Pages: 2228-2233 |
| DOI: 10.1021/acs.nanolett.5b04511 |
| Published: APR 2016 |
| Abstract: The negatively charged nitrogen-vacancy (NV) center in diamond has been shown recently as an excellent sensor for external spins. Nevertheless, their optimum engineering in the near-surface region still requires quantitative knowledge in regard to their activation by vacancy capture during thermal annealing. To this aim, we report on the depth profiles of near-surface helium-induced NV centers (and related helium defects) by step-etching with nanometer resolution. This provides insights into the efficiency of vacancy diffusion and recombination paths concurrent to the formation of NV centers. It was found that the range of efficient formation of NV centers is limited only to approximately 10 to 15 nm (radius) around the initial ion track of irradiating helium atoms. Using this information we demonstrate the fabrication of nanometric-thin (delta) profiles of NV centers for sensing external spins at the diamond surface based on a three-step approach, which comprises (i) nitrogen-doped epitaxial CVD diamond overgrowth, (ii) activation of NV centers by low-energy helium irradiation and thermal annealing, and (iii) controlled layer thinning by low-damage plasma etching. Spin coherence times (Hahn echo) ranging up to 50 mu s are demonstrated at depths of less than 5 nm in material with 1.1% of C-13 (depth estimated by spin relaxation (T-1) measurements). At the end, the limits of the helium irradiation technique at high ion fluences are also experimentally investigated. |
| Accession Number: WOS:000374274600015 |
| PubMed ID: 26938259 |
| Record 142 of 225 |
| By: Barclay, PE (Barclay, Paul E.); Fu, KM (Fu, Kai-Mei); Jelezko, F (Jelezko, Fedor); Loncar, M (Loncar, Marko) |
| Title: Diamond photonics: introduction |
| Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS |
| Volume: 33 |
| Issue: 4 |
| Pages: DP1-DP1 |
| DOI: 10.1364/JOSAB.33.000DP1 |
| Published: APR 1 2016 |
| Abstract: During the past decade, diamond has emerged as one of the most exciting materials of study within the field of photonics. This special issue is an attempt to demonstrate the breadth of impact that diamond has made on a range of fields, including quantum optics, nanophotonics, magnetometry and sensing, laser development, and color center physics. (C) 2016 Optical Society of America |
| Accession Number: WOS:000374106200002 |
| Record 143 of 225 |
| By: Rogers, L (Rogers, Lachlan); Jelezko, F (Jelezko, Fedor) |
| Title: QUANTUM OPTICS Robust light-controlled qubits |
| Source: NATURE PHOTONICS |
| Volume: 10 |
| Issue: 3 |
| Pages: 147-148 |
| DOI: 10.1038/nphoton.2016.29 |
| Published: MAR 2016 |
| Accession Number: WOS:000371218900008 |
| Record 144 of 225 |
| By: Chen, Q (Chen, Q.); Schwarz, I (Schwarz, I.); Jelezko, F (Jelezko, F.); Retzker, A (Retzker, A.); Plenio, MB (Plenio, M. B.) |
| Title: Resonance-inclined optical nuclear spin polarization of liquids in diamond structures |
| Source: PHYSICAL REVIEW B |
| Volume: 93 |
| Issue: 6 |
| Article Number: 060408 |
| DOI: 10.1103/PhysRevB.93.060408 |
| Published: FEB 24 2016 |
| Abstract: Dynamic nuclear polarization (DNP) of molecules in a solution at room temperature has the potential to revolutionize nuclear magnetic resonance spectroscopy and imaging. The prevalent methods for achieving DNP in solutions are typically most effective in the regime of small interaction correlation times between the electron and nuclear spins, limiting the size of accessible molecules. To solve this limitation, we design a mechanism for DNP in the liquid phase that is applicable for large interaction correlation times. Importantly, while this mechanism makes use of a resonance condition similar to solid-state DNP, the polarization transfer is robust to a relatively large detuning from the resonance due to molecular motion. We combine this scheme with optically polarized nitrogen-vacancy (NV) center spins in nanodiamonds to design a setup that employs optical pumping and is therefore not limited by room temperature electron thermal polarization. We illustrate numerically the effectiveness of the model in a flow cell containing nanodiamonds immobilized in a hydrogel, polarizing flowing water molecules 4700-fold above thermal polarization in a magnetic field of 0.35 T, in volumes detectable by current NMR scanners. |
| Accession Number: WOS:000370794000001 |
| Record 145 of 225 |
| By: Lovchinsky, I (Lovchinsky, I.); Sushkov, AO (Sushkov, A. O.); Urbach, E (Urbach, E.); de Leon, NP (de Leon, N. P.); Choi, S (Choi, S.); De Greve, K (De Greve, K.); Evans, R (Evans, R.); Gertner, R (Gertner, R.); Bersin, E (Bersin, E.); Muller, C (Mueller, C.); McGuinness, L (McGuinness, L.); Jelezko, F (Jelezko, F.); Walsworth, RL (Walsworth, R. L.); Park, H (Park, H.); Lukin, MD (Lukin, M. D.) |
| Title: APPLIED PHYSICS Nuclear magnetic resonance detection and spectroscopy of single proteins using quantum logic |
| Source: SCIENCE |
| Volume: 351 |
| Issue: 6275 |
| Pages: 836-841 |
| DOI: 10.1126/science.aad8022 |
| Published: FEB 19 2016 |
| Abstract: Nuclear magnetic resonance spectroscopy is a powerful tool for the structural analysis of organic compounds and biomolecules but typically requires macroscopic sample quantities. We use a sensor, which consists of two quantum bits corresponding to an electronic spin and an ancillary nuclear spin, to demonstrate room temperaturemagnetic resonance detection and spectroscopy of multiple nuclear species within individual ubiquitin proteins attached to the diamond surface. Using quantum logic to improve readout fidelity and a surface-treatment technique to extend the spin coherence time of shallow nitrogen-vacancy centers, we demonstrate magnetic field sensitivity sufficient to detect individual proton spins within 1 second of integration. This gain in sensitivity enables high-confidence detection of individual proteins and allows us to observe spectral features that reveal information about their chemical composition. |
| Accession Number: WOS:000370325700039 |
| PubMed ID: 26847544 |
| Record 146 of 225 |
| By: Doi, Y (Doi, Yuki); Fukui, T (Fukui, Takahiro); Kato, H (Kato, Hiromitsu); Makino, T (Makino, Toshiharu); Yamasaki, S (Yamasaki, Satoshi); Tashima, T (Tashima, Toshiyuki); Morishita, H (Morishita, Hiroki); Miwa, S (Miwa, Shinji); Jelezko, F (Jelezko, Fedor); Suzuki, Y (Suzuki, Yoshishige); Mizuochi, N (Mizuochi, Norikazu) |
| Title: Pure negatively charged state of the NV center in n-type diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 93 |
| Issue: 8 |
| Article Number: 081203 |
| DOI: 10.1103/PhysRevB.93.081203 |
| Published: FEB 3 2016 |
| Abstract: Optical illumination on negatively charged nitrogen-vacancy (NV-) centers inevitably causes stochastic charge-state transitions between the NV- and the neutral charge state of the NV center. It limits the steady-state population of NV- to 5% at minimum (similar to 610 nm) and 80% (similar to 532 nm) at maximum in intrinsic diamond depending on the wavelength. Here, we show Fermi-level control by phosphorus doping generates 99.4 +/- 0.1% NV- under 1-mu W and 593-nm excitation which is close to maximum absorption of NV-. The pure NV- shows a fivefold increase in luminescence and a fourfold enhancement of an optically detected magnetic resonance under 593-nm excitation compared with those in intrinsic diamond. |
| Accession Number: WOS:000369404500002 |
| Record 147 of 225 |
| By: Scheuer, J (Scheuer, Jochen); Schwartz, I (Schwartz, Ilai); Chen, Q (Chen, Qiong); Schulze-Sunninghausen, D (Schulze-Suenninghausen, David); Carl, P (Carl, Patrick); Hofer, P (Hoefer, Peter); Retzker, A (Retzker, Alexander); Sumiya, H (Sumiya, Hitoshi); Isoya, J (Isoya, Junichi); Luy, B (Luy, Burkhard); Plenio, MB (Plenio, Martin B.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Optically induced dynamic nuclear spin polarisation in diamond |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 18 |
| Article Number: 013040 |
| DOI: 10.1088/1367-2630/18/1/013040 |
| Published: JAN 18 2016 |
| Abstract: The sensitivity of magnetic resonance imaging (MRI) depends strongly on nuclear spin polarisation and, motivated by this observation, dynamical nuclear spin polarisation has recently been applied to enhance MRI protocols (Kurhanewicz et al 2011 Neoplasia 13 81). Nuclear spins associated with the C-13 carbon isotope (nuclear spin I = 1/2) in diamond possess uniquely long spin lattice relaxation times (Reynhardt and High 2011 Prog. Nucl. Magn. Reson. Spectrosc. 38 37). If they are present in diamond nanocrystals, especially when strongly polarised, they form a promising contrast agent for MRI. Current schemes for achieving nuclear polarisation, however, require cryogenic temperatures. Here we demonstrate an efficient scheme that realises optically induced C-13 nuclear spin hyperpolarisation in diamond at room temperature and low ambient magnetic field. Optical pumping of a nitrogen-vacancy centre creates a continuously renewable electron spin polarisation which can be transferred to surrounding C-13 nuclear spins. Importantly for future applications we also realise polarisation protocols that are robust against an unknown misalignment between magnetic field and crystal axis. |
| Accession Number: WOS:000372366400003 |
| Record 148 of 225 |
| By: Lehtinen, O (Lehtinen, Ossi); Naydenov, B (Naydenov, Boris); Borner, P (Boerner, Pia); Melentjevic, K (Melentjevic, Kristina); Muller, C (Mueller, Christoph); McGuinness, LP (McGuinness, Liam Paul); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Kaiser, U (Kaiser, Ute); Jelezko, F (Jelezko, Fedor) |
| Title: Molecular dynamics simulations of shallow nitrogen and silicon implantation into diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 93 |
| Issue: 3 |
| Article Number: 035202 |
| DOI: 10.1103/PhysRevB.93.035202 |
| Published: JAN 11 2016 |
| Abstract: A solid understanding of the implantation process of N and Si ions into diamond is needed for the controlled creation of shallow color centers for quantum computing, simulation, and sensing applications. Here, molecular dynamics simulations of the shallow implantation of N and Si ions into diamond is simulated at 100-5000 eV kinetic energies and different angles of incidence. We find that ion channeling is an important effect with an onset energy depending on the crystal orientation. Consequently, the molecular dynamics simulations produce improved predictions as compared to standard Monte Carlo simulations. When implanting in a channeling direction, the spatial distribution of the channeled ions becomes markedly narrow, allowing a higher degree of control over the location of the nitrogen vacancy (NV-) centers. A contamination layer on the ion entry surface reduces the fraction of channeled ions. A comparison to an experimentally determined depth profile based on a NMR signal from protons yields a quantitative agreement, validating the simulation approach. |
| Accession Number: WOS:000367893400004 |
| Record 149 of 225 |
| By: Marseglia, L (Marseglia, L.); Saha, K (Saha, K.); Ajoy, A (Ajoy, A.); Schroder, T (Schroder, T.); Englund, D (Englund, D.); Teraji, T (Teraji, T.); Isoya, J (Isoya, J.); Jelezko, F (Jelezko, F.); Walsworth, R (Walsworth, R.); Pacheco, JL (Pacheco, J. L.); Perry, DL (Perry, D. L.); Bielejec, ES (Bielejec, E. S.); Cappellaro, P (Cappellaro, P.) |
| Book Group Author(s): IEEE |
| Title: A bright nanowire single photon source |
| Source: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) |
| Book Series Title: Conference on Lasers and Electro-Optics |
| Published: 2016 |
| Abstract: Silicon-vacancy ( SiV) centers in diamond are bright sources of indistinguishable single photons. We report fabrication of nanowires coupled to single SiV by deterministic ion implantation, yielding greatly enhanced light coupling compared to SiV in bulk. |
| Conference Title: Conference on Lasers and Electro-Optics (CLEO) |
| Conference Date: JUN 05-10, 2016 |
| Conference Location: San Jose, CA |
| Accession Number: WOS:000391286401061 |
| Record 150 of 225 |
| By: Shinada, T (Shinada, Takahiro); Prati, E (Prati, Enrico); Tanii, T (Tanii, Takashi); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); Jelezko, F (Jelezko, Fedor); Isoya, J (Isoya, Junnichi) |
| Book Group Author(s): IEEE |
| Title: Deterministic doping to silicon and diamond materials for quantum processing |
| Source: 2016 IEEE 16TH INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY (IEEE-NANO) |
| Pages: 888-890 |
| Published: 2016 |
| Abstract: Nanoscale electronic devices will require the placement of dopants in a predetermined location, namely, a single atom control to explore novel functions for future nanoelectronics. Deterministic doping method, i.e. single-ion implantation, realizes ordered arrays of single-atoms in silicon, diamond and other materials, which might provide opportunities to single-dopant transport or single-photon source beneficial to quantum processing. |
| Conference Title: 16th IEEE International Conference on Nanotechnology (IEEE-NANO) |
| Conference Date: AUG 22-25, 2016 |
| Conference Location: IEEE Nanotechnol Council, Sendai, JAPAN |
| Sponsor(s): IEEE; Japan Soc Appl Phys; Tohoku Univ; Japan Soc Mech Engineers; Soc Nano Sci & Technol; IEEE Sendai Sect; IEEE Electron Device Soc Japan Chapter; Tohoku Univ, Core Technol Consortium Adv Energy Devices; COl Tohoku; Tohoku Univ, Jun ichi Nishizawa Memorial Res Ctr; Intelligent Nano Proc Soc; Frontier Proc Soc; Tohoku Univ, Inst Fluid Sci, Nano Micro Cluster; Tohoku Univ, Adv Inst Mat Res |
| Conference Host: IEEE Nanotechnol Council |
| Accession Number: WOS:000391840000253 |
| Record 151 of 225 |
| By: Liu, Y (Liu, Yan); Siyushev, P (Siyushev, Petr); Rong, YY (Rong, Youying); Wu, BT (Wu, Botao); McGuinness, LP (McGuinness, Liam Paul); Jelezko, F (Jelezko, Fedor); Tamura, S (Tamura, Syuto); Tanii, T (Tanii, Takashi); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); Isoya, J (Isoya, Junichi); Shinada, T (Shinada, Takahiro); Zeng, HP (Zeng, Heping); Wu, E (Wu, E.) |
| Title: Investigation of the silicon vacancy color center for quantum key distribution |
| Source: OPTICS EXPRESS |
| Volume: 23 |
| Issue: 26 |
| Pages: 32961-32967 |
| Article Number: 248544 |
| DOI: 10.1364/OE.23.032961 |
| Published: DEC 28 2015 |
| Abstract: Single photon sources (SPS) are crucial for quantum key distribution. Here we demonstrate a stable triggered SPS at 738 nm with linewidth less than 5 nm at room temperature based on a negatively charged single silicon vacancy color center. Thanks to the short photon duration of about 1.3-1.7 ns, by using high repetition pulsed excitation at 30 MHz, the triggered single photon source generates 16.6 kcounts/s. And we discuss the feasibility of this triggered SPS in the application of quantum key distribution. (C) 2015 Optical Society of America |
| Accession Number: WOS:000368004600009 |
| PubMed ID: 26831963 |
| Record 152 of 225 |
| By: Scheuer, J (Scheuer, Jochen); Stark, A (Stark, Alexander); Kost, M (Kost, Matthias); Plenio, MB (Plenio, Martin B.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Accelerated 2D magnetic resonance spectroscopy of single spins using matrix completion |
| Source: SCIENTIFIC REPORTS |
| Volume: 5 |
| Article Number: 17728 |
| DOI: 10.1038/srep17728 |
| Published: DEC 3 2015 |
| Abstract: Two dimensional nuclear magnetic resonance (NMR) spectroscopy is one of the major tools for analysing the chemical structure of organic molecules and proteins. Despite its power, this technique requires long measurement times, which, particularly in the recently emerging diamond based single molecule NMR, limits its application to stable samples. Here we demonstrate a method which allows to obtain the spectrum by collecting only a small fraction of the experimental data. Our method is based on matrix completion which can recover the full spectral information from randomly sampled data points. We confirm experimentally the applicability of this technique by performing two dimensional electron spin echo envelope modulation (ESEEM) experiments on a two spin system consisting of a single nitrogen vacancy (NV) centre in diamond coupled to a single C-13 nuclear spin. The signal to noise ratio of the recovered 2D spectrum is compared to the Fourier transform of randomly subsampled data, where we observe a strong suppression of the noise when the matrix completion algorithm is applied. We show that the peaks in the spectrum can be obtained with only 10% of the total number of the data points. We believe that our results reported here can find an application in all types of two dimensional spectroscopy, as long as the measured matrices have a low rank. |
| Accession Number: WOS:000365707200001 |
| PubMed ID: 26631593 |
| Record 153 of 225 |
| By: Nagumo, R (Nagumo, R.); Brandenburg, F (Brandenburg, F.); Ermakova, A (Ermakova, A.); Jelezko, F (Jelezko, F.); Yatsui, T (Yatsui, T.) |
| Title: Spectral control of nanodiamond using dressed photon-phonon etching |
| Source: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING |
| Volume: 121 |
| Issue: 4 |
| Pages: 1335-1339 |
| DOI: 10.1007/s00339-015-9400-0 |
| Published: DEC 2015 |
| Abstract: The luminescence of a nitrogen-vacancy (NV) center in a nanodiamond (ND) is of great interest because of its features, especially in the field of nanophotonics. When an NV center in an ND is located in the vicinity of the surface, the emission is often disturbed by any surface defects, resulting in non-radiative recombination. In this work, we performed dressed photon-phonon (DPP) etching of the NDs, and found that the size of the NDs decreased, while the cathodoluminescence (CL) intensity increased. We assume that this increase in the CL intensity originates from the removal of the surface protrusions and/or defects by DPP etching. |
| Accession Number: WOS:000365722800003 |
| Record 154 of 225 |
| By: Chen, Q (Chen, Q.); Schwarz, I (Schwarz, I.); Jelezko, F (Jelezko, F.); Retzker, A (Retzker, A.); Plenio, MB (Plenio, M. B.) |
| Title: Optical hyperpolarization of C-13 nuclear spins in nanodiamond ensembles |
| Source: PHYSICAL REVIEW B |
| Volume: 92 |
| Issue: 18 |
| Article Number: 184420 |
| DOI: 10.1103/PhysRevB.92.184420 |
| Published: NOV 18 2015 |
| Abstract: Dynamical nuclear polarization holds the key for orders of magnitude enhancements of nuclear magnetic resonance signals which, in turn, would enable a wide range of novel applications in biomedical sciences. However, current implementations of DNP require cryogenic temperatures and long times for achieving high polarization. Here we propose and analyze in detail protocols that can achieve rapid hyperpolarization of C-13 nuclear spins in randomly oriented ensembles of nanodiamonds at room temperature. Our protocols exploit a combination of optical polarization of electron spins in nitrogen-vacancy centers and the transfer of this polarization to C-13 nuclei by means of microwave control to overcome the severe challenges that are posed by the random orientation of the nanodiamonds and their nitrogen-vacancy centers. Specifically, these random orientations result in exceedingly large energy variations of the electron spin levels that render the polarization and coherent control of the nitrogen-vacancy center electron spins as well as the control of their coherent interaction with the surrounding C-13 nuclear spins highly inefficient. We address these challenges by a combination of an off-resonant microwave double resonance scheme in conjunction with a realization of the integrated solid effect which, together with adiabatic rotations of external magnetic fields or rotations of nanodiamonds, leads to a protocol that achieves high levels of hyperpolarization of the entire nuclear-spin bath in a randomly oriented ensemble of nanodiamonds even at room temperature. This hyperpolarization together with the long nuclear-spin polarization lifetimes in nanodiamonds and the relatively high density of C-13 nuclei has the potential to result in a major signal enhancement in C-13 nuclear magnetic resonance imaging and suggests functionalized and hyperpolarized nanodiamonds as a unique probe for molecular imaging both in vitro and in vivo. |
| Accession Number: WOS:000364812000004 |
| Record 155 of 225 |
| By: Wu, YZ (Wu, Yuzhou); Ermakova, A (Ermakova, Anna); Liu, WN (Liu, Weina); Pramanik, G (Pramanik, Goutam); Vu, TM (Tran Minh Vu); Kurz, A (Kurz, Andrea); McGuinness, L (McGuinness, Liam); Naydenov, B (Naydenov, Boris); Hafner, S (Hafner, Susanne); Reuter, R (Reuter, Rolf); Wrachtrup, J (Wrachtrup, Joerg); Isoya, J (Isoya, Junichi); Fortsch, C (Foertsch, Christina); Barth, H (Barth, Holger); Simmet, T (Simmet, Thomas); Jelezko, F (Jelezko, Fedor); Weil, T (Weil, Tanja) |
| Title: Programmable Biopolymers for Advancing Biomedical Applications of Fluorescent Nanodiamonds |
| Source: ADVANCED FUNCTIONAL MATERIALS |
| Volume: 25 |
| Issue: 42 |
| Pages: 6576-6585 |
| DOI: 10.1002/adfm.201502704 |
| Published: NOV 11 2015 |
| Abstract: A versatile biopolymer platform for advancing nanodiamonds (NDs) as unique magnetooptic materials for biomedical applications is presented here. Precision biopolymer coatings are designed by chemical reprogramming the functionalities of serum albumin via a straightforward synthesis protocol. Such biopolymers offer high biocompatibility and precise modification with various functional entities due to the large number of available reactive amino acid residues. Premodification of these biopolymers provides a convenient approach to customized surface functionalization of NDs. As an example, the anticancer drug doxorubicin (DOX) is conjugated to the biopolymer with high reproducibility and full characterization. The biopolymer-coated NDs reveal excellent colloidal stabilities in all physiological media tested, even after loading with high numbers of hydrophobic DOX. The intracellular distribution of NDs and DOX is analyzed in living cells by recording the fluorescence spectra in different cellular compartments, which proves efficient intracellular release of DOX from the carrier. Studies in vitro as well as in a chick tumor xenograft model reveal efficient antitumor effects. The facile and versatile biopolymer coating strategy reported herein will greatly accelerate the availability of customized NDs with reliable and reproducible features to exploit their great potential in single molecular bioimaging, in vivo biosensing, and high resolution quantum optics. |
| Accession Number: WOS:000365532100002 |
| Record 156 of 225 |
| By: Teraji, T (Teraji, Tokuyuki); Yamamoto, T (Yamamoto, Takashi); Watanabe, K (Watanabe, Kenji); Koide, Y (Koide, Yasuo); Isoya, J (Isoya, Junichi); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); Rogers, LJ (Rogers, Lachlan J.); Jelezko, F (Jelezko, Fedor); Neumann, P (Neumann, Philipp); Wrachtrup, J (Wrachtrup, Joerg); Koizumi, S (Koizumi, Satoshi) |
| Title: Homoepitaxial diamond film growth: High purity, high crystalline quality, isotopic enrichment, and single color center formation |
| Source: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE |
| Volume: 212 |
| Issue: 11 |
| Special Issue: SI |
| Pages: 2365-2384 |
| DOI: 10.1002/pssa.201532449 |
| Published: NOV 2015 |
| Abstract: With optical/electronic devices of the next generation in mind, we provide a guideline for the growth of homoepitaxial diamond films that possess higher crystalline quality, higher chemical purity, and a higher carbon isotopic ratio. A custom-built microwave plasma-assisted chemical vapor deposition system was constructed to achieve these requirements. To improve both the purity and crystalline quality of homoepitaxial diamond films, an advanced growth condition was applied: higher oxygen concentration in the growth ambient. Under this growth condition for high-quality diamond, a thick diamond film of >= 30 mu m was deposited reproducibly while maintaining high purity and a flat surface. Then, combining this advanced growth condition for non-doped diamond with a unique doping technique that provides parts-per-billion order doping, single-color centers of either nitrogen-vacancy or silicon-vacancy centers that show excellent properties were formed. The new idea of using these color centers as a probe for detecting tiny amounts of impurities was presented. These advanced growth and characterization techniques are expected to open up new fields of diamond research that require extremely low-impurity concentration, for use in power devices and quantum information devices. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| Accession Number: WOS:000366588100002 |
| Record 157 of 225 |
| By: Shershulin, VA (Shershulin, Vladimir A.); Sedov, VS (Sedov, Vadim S.); Ermakova, A (Ermakova, Anna); Jantzen, U (Jantzen, Uwe); Rogers, L (Rogers, Lachlan); Huhlina, AA (Huhlina, Anastasia A.); Teverovskaya, EG (Teverovskaya, Ekaterina G.); Ralchenko, VG (Ralchenko, Victor G.); Jelezko, F (Jelezko, Fedor); Vlasov, II (Vlasov, Igor I.) |
| Title: Size-dependent luminescence of color centers in composite nanodiamonds |
| Source: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE |
| Volume: 212 |
| Issue: 11 |
| Special Issue: SI |
| Pages: 2600-2605 |
| DOI: 10.1002/pssa.201532204 |
| Published: NOV 2015 |
| Abstract: Luminescence properties of nitrogen-vacancy (NV) and silicon-vacancy (SiV) centers were investigated for the series of O-terminated composite nanodiamonds consisting of a high-pressure-high-temperature(HPHT) diamondcore and a chemical-vapor-deposition (CVD) diamond outer layer of different thickness. It was found that emission of NV and SiV centers cease to "feel" the diamond surface at a distance of 12 and 4 nm, respectively, from it. This finding determines minimum sizes of O-terminated nanodiamonds in which stable single photon emitters could be formed based on NV and SiV centers. Suggested composite diamond nanostructure are optimal for design of two-color luminescent markers. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| Accession Number: WOS:000366588100035 |
| Record 158 of 225 |
| By: Mkhitaryan, VV (Mkhitaryan, V. V.); Jelezko, F (Jelezko, F.); Dobrovitski, VV (Dobrovitski, V. V.) |
| Title: Highly selective detection of individual nuclear spins with rotary echo on an electron spin probe |
| Source: SCIENTIFIC REPORTS |
| Volume: 5 |
| Article Number: 15402 |
| DOI: 10.1038/srep15402 |
| Published: OCT 26 2015 |
| Abstract: We consider an electronic spin, such as a nitrogen-vacancy center in diamond, weakly coupled to a large number of nuclear spins, and subjected to the Rabi driving with a periodically alternating phase. We show that by switching the driving phase synchronously with the precession of a given nuclear spin, the interaction to this spin is selectively enhanced, while the rest of the bath remains decoupled. The enhancement is of resonant character. The key feature of the suggested scheme is that the width of the resonance is adjustable, and can be greatly decreased by increasing the driving strength. Thus, the resonance can be significantly narrowed, by a factor of 10-100 in comparison with the existing detection methods. Significant improvement in selectivity is explained analytically and confirmed by direct numerical many-spin simulations. The method can be applied to a wide range of solid-state systems. |
| Accession Number: WOS:000363394300001 |
| PubMed ID: 26497777 |
| Record 159 of 225 |
| By: Bourgeois, E (Bourgeois, E.); Jarmola, A (Jarmola, A.); Siyushev, P (Siyushev, P.); Gulka, M (Gulka, M.); Hruby, J (Hruby, J.); Jelezko, F (Jelezko, F.); Budker, D (Budker, D.); Nesladek, M (Nesladek, M.) |
| Title: Photoelectric detection of electron spin resonance of nitrogen-vacancy centres in diamond |
| Source: NATURE COMMUNICATIONS |
| Volume: 6 |
| Article Number: 8577 |
| DOI: 10.1038/ncomms9577 |
| Published: OCT 2015 |
| Abstract: The readout of negatively charged nitrogen-vacancy centre electron spins is essential for applications in quantum computation, metrology and sensing. Conventional readout protocols are based on the detection of photons emitted from nitrogen-vacancy centres, a process limited by the efficiency of photon collection. We report on an alternative principle for detecting the magnetic resonance of nitrogen-vacancy centres, allowing the direct photoelectric readout of nitrogen-vacancy centres spin state in an all-diamond device. The photocurrent detection of magnetic resonance scheme is based on the detection of charge carriers promoted to the conduction band of diamond by two-photon ionization of nitrogen-vacancy centres. The optical and photoelectric detection of magnetic resonance are compared, by performing both types of measurements simultaneously. The minima detected in the measured photocurrent at resonant microwave frequencies are attributed to the spin-dependent ionization dynamics of nitrogen-vacancy, originating from spin-selective non-radiative transitions to the metastable singlet state. |
| Accession Number: WOS:000364932600024 |
| PubMed ID: 26486014 |
| Record 160 of 225 |
| By: Zhang, T (Zhang, Tao); Neumann, A (Neumann, Andre); Lindlau, J (Lindlau, Jessica); Wu, YZ (Wu, Yuzhou); Prarnanik, G (Prarnanik, Goutam); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Schuder, F (Schueder, Florian); Huber, S (Huber, Sebastian); Huber, M (Huber, Marinus); Stehr, F (Stehr, Florian); Hogele, A (Hoegele, Alexander); Weil, T (Weil, Tanja); Liedl, T (Liedl, Tim) |
| Title: DNA-Based Self-Assembly of Fluorescent Nanodiamonds |
| Source: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY |
| Volume: 137 |
| Issue: 31 |
| Pages: 9776-9779 |
| DOI: 10.1021/jacs.5b04857 |
| Published: AUG 12 2015 |
| Abstract: As a step toward deterministic and scalable assembly of ordered spin arrays we here demonstrate a bottom-up approach to position fluorescent nanodiamonds (NDs) with nanometer precision on DNA origami structures. We have realized a reliable and broadly applicable surface modification strategy that results in DNA-functionalized and perfectly dispersed NDs that were then self-assembled in predefined geometries. With optical studies we show that the fluorescence properties of the nitrogen-vacancy color centers in NDs are preserved during surface modification and DNA assembly. As this method allows the nanoscale arrangement of fluorescent NDs together with other optically active components in complex geometries, applications based on self-assembled spin lattices or plasmon-enhanced spin sensors as well as improved fluorescent labeling for bioimaging could be envisioned. |
| Accession Number: WOS:000359613300005 |
| PubMed ID: 26196373 |
| Record 161 of 225 |
| By: Iwasaki, T (Iwasaki, Takayuki); Ishibashi, F (Ishibashi, Fumitaka); Miyamoto, Y (Miyamoto, Yoshiyuki); Doi, Y (Doi, Yuki); Kobayashi, S (Kobayashi, Satoshi); Miyazaki, T (Miyazaki, Takehide); Tahara, K (Tahara, Kosuke); Jahnke, KD (Jahnke, Kay D.); Rogers, LJ (Rogers, Lachlan J.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Yamasaki, S (Yamasaki, Satoshi); Nagamachi, S (Nagamachi, Shinji); Inubushi, T (Inubushi, Toshiro); Mizuochi, N (Mizuochi, Norikazu); Hatano, M (Hatano, Mutsuko) |
| Title: Germanium-Vacancy Single Color Centers in Diamond |
| Source: SCIENTIFIC REPORTS |
| Volume: 5 |
| Article Number: 12882 |
| DOI: 10.1038/srep12882 |
| Published: AUG 7 2015 |
| Abstract: Atomic-sized fluorescent defects in diamond are widely recognized as a promising solid state platform for quantum cryptography and quantum information processing. For these applications, single photon sources with a high intensity and reproducible fabrication methods are required. In this study, we report a novel color center in diamond, composed of a germanium (Ge) and a vacancy (V) and named the GeV center, which has a sharp and strong photoluminescence band with a zero-phonon line at 602 nm at room temperature. We demonstrate this new color center works as a single photon source. Both ion implantation and chemical vapor deposition techniques enabled fabrication of GeV centers in diamond. A first-principles calculation revealed the atomic crystal structure and energy levels of the GeV center. |
| Accession Number: WOS:000359116900001 |
| PubMed ID: 26250337 |
| Record 162 of 225 |
| By: Kong, X (Kong, Xi); Stark, A (Stark, Alexander); Du, JF (Du, Jiangfeng); McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Towards Chemical Structure Resolution with Nanoscale Nuclear Magnetic Resonance Spectroscopy |
| Source: PHYSICAL REVIEW APPLIED |
| Volume: 4 |
| Issue: 2 |
| Article Number: 024004 |
| DOI: 10.1103/PhysRevApplied.4.024004 |
| Published: AUG 6 2015 |
| Abstract: Nuclear magnetic resonance spectroscopy has approached the limit of single-molecule sensitivity; however, the spectral resolution is currently insufficient to obtain detailed information on chemical structure and molecular interactions. Here we demonstrate more than 2 orders of magnitude improvement in spectral resolution by performing correlation spectroscopy with shallow nitrogen-vacancy magnetic sensors in diamond. In principle, the resolution is sufficient to observe chemical shifts in approximately 1 T magnetic fields and is currently limited by molecular diffusion at the surface. We measure oil diffusion rates of D = 0.15-0.2 nm(2)/mu s within (5 nm)(3) volumes at the diamond surface. |
| Accession Number: WOS:000359059900002 |
| Record 163 of 225 |
| By: Liu, Y (Liu, Yan); Chen, GX (Chen, Gengxu); Rong, YY (Rong, Youying); McGuinness, LP (McGuinness, Liam Paul); Jelezko, F (Jelezko, Fedor); Tamura, S (Tamura, Syuto); Tanii, T (Tanii, Takashi); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); Isoya, J (Isoya, Junichi); Shinada, T (Shinada, Takahiro); Wu, E (Wu, E.); Zeng, HP (Zeng, Heping) |
| Title: Fluorescence Polarization Switching from a Single Silicon Vacancy Colour Centre in Diamond |
| Source: SCIENTIFIC REPORTS |
| Volume: 5 |
| Article Number: 12244 |
| DOI: 10.1038/srep12244 |
| Published: JUL 23 2015 |
| Abstract: Single-photon emitters with stable and uniform photoluminescence properties are important for quantum technology. However, in many cases, colour centres in diamond exhibit spectral diffusion and photoluminescence intensity fluctuation. It is therefore essential to investigate the dynamics of colour centres at the single defect level in order to enable the on-demand manipulation and improved applications in quantum technology. Here we report the polarization switching, intensity jumps and spectral shifting observed on a negatively charged single silicon-vacancy colour centre in diamond. The observed phenomena elucidate the single emitter dynamics induced by photoionization of nearby electron donors in the diamond. |
| Accession Number: WOS:000358357600001 |
| PubMed ID: 26202940 |
| Record 164 of 225 |
| By: Shimo-Oka, T (Shimo-Oka, T.); Kato, H (Kato, H.); Yamasaki, S (Yamasaki, S.); Jelezko, F (Jelezko, F.); Miwa, S (Miwa, S.); Suzuki, Y (Suzuki, Y.); Mizuochi, N (Mizuochi, N.) |
| Title: Control of coherence among the spins of a single electron and the three nearest neighbor C-13 nuclei of a nitrogen-vacancy center in diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 106 |
| Issue: 15 |
| Article Number: 153103 |
| DOI: 10.1063/1.4917539 |
| Published: APR 13 2015 |
| Abstract: Individual nuclear spins in diamond can be optically detected through hyperfine couplings with the electron spin of a single nitrogen-vacancy (NV) center; such nuclear spins have outstandingly long coherence times. Among the hyperfine couplings in the NV center, the nearest neighbor C-13 nuclear spins have the largest coupling strength. Nearest neighbor C-13 nuclear spins have the potential to perform fastest gate operations, providing highest fidelity in quantum computing. Herein, we report on the control of coherences in the NV center where all three nearest neighbor carbons are of the C-13 isotope. Coherence among the three and four qubits are generated and analyzed at room temperature. (c) 2015 AIP Publishing LLC. |
| Accession Number: WOS:000353160700037 |
| Record 165 of 225 |
| By: Jahnke, KD (Jahnke, Kay D.); Sipahigil, A (Sipahigil, Alp); Binder, JM (Binder, Jan M.); Doherty, MW (Doherty, Marcus W.); Metsch, M (Metsch, Mathias); Rogers, LJ (Rogers, Lachlan J.); Manson, NB (Manson, Neil B.); Lukin, MD (Lukin, Mikhail D.); Jelezko, F (Jelezko, Fedor) |
| Title: Electron-phonon processes of the silicon-vacancy centre in diamond |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 17 |
| Article Number: 043011 |
| DOI: 10.1088/1367-2630/17/4/043011 |
| Published: APR 8 2015 |
| Abstract: We investigate phonon induced electronic dynamics in the ground and excited states of the negatively charged silicon-vacancy (SiV-) centre in diamond. Optical transition line widths, transition wavelength and excited state lifetimes are measured for the temperature range 4 K-350 K. The ground state orbital relaxation rates are measured using time-resolved fluorescence techniques. A microscopic model of the thermal broadening in the excited and ground states of the SiV- centre is developed. A vibronic process involving single-phonon transitions is found to determine orbital relaxation rates for both the ground and the excited states at cryogenic temperatures. We discuss the implications of our findings for coherence of qubits in the ground states and propose methods to extend coherence times of SiV- qubits. |
| Accession Number: WOS:000354019500005 |
| Record 166 of 225 |
| By: Osterkamp, C (Osterkamp, Christian); Lang, J (Lang, Johannes); Scharpf, J (Scharpf, Jochen); Muller, C (Mueller, Christoph); McGuinness, LP (McGuinness, Liam Paul); Diemant, T (Diemant, Thomas); Behm, RJ (Behm, R. Juergen); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Stabilizing shallow color centers in diamond created by nitrogen delta-doping using SF6 plasma treatment |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 106 |
| Issue: 11 |
| Article Number: 113109 |
| DOI: 10.1063/1.4915305 |
| Published: MAR 16 2015 |
| Abstract: Here we report the fabrication of stable, shallow (<5 nm) nitrogen-vacancy (NV) centers in diamond by nitrogen delta doping at the last stage of the chemical vapor deposition growth process. The NVs are stabilized after treating the diamond in SF6 plasma, otherwise the color centers are not observed, suggesting a strong influence from the surface. X-ray photoelectron spectroscopy measurements show the presence of only fluorine atoms on the surface, in contrast to previous studies, indicating very good surface coverage. We managed to detect hydrogen nuclear magnetic resonance signal from protons in the immersion oil, revealing a depth of the NVs of about 5 nm. (C) 2015 AIP Publishing LLC. |
| Accession Number: WOS:000351595500046 |
| Record 167 of 225 |
| By: McGuinness, LP (McGuinness, Liam P.); Jelezko, F (Jelezko, Fedor) |
| Title: Look but don't touch the metals |
| Source: SCIENCE |
| Volume: 347 |
| Issue: 6226 |
| Pages: 1073-1074 |
| DOI: 10.1126/science.aaa6908 |
| Published: MAR 6 2015 |
| Accession Number: WOS:000350354200023 |
| PubMed ID: 25745151 |
| Record 168 of 225 |
| By: Stangenberg, R (Stangenberg, Rene); Wu, YZ (Wu, Yuzhou); Hedrich, J (Hedrich, Jana); Kurzbach, D (Kurzbach, Dennis); Wehner, D (Wehner, Daniel); Weidinger, G (Weidinger, Gilbert); Kuan, SL (Kuan, Seah Ling); Jansen, MI (Jansen, Malin Insa); Jelezko, F (Jelezko, Fedor); Luhmann, HJ (Luhmann, Heiko J.); Hinderberger, D (Hinderberger, Dariush); Weil, T (Weil, Tanja); Mullen, K (Muellen, Klaus) |
| Title: A Polyphenylene Dendrimer Drug Transporter with Precisely Positioned Amphiphilic Surface Patches |
| Source: ADVANCED HEALTHCARE MATERIALS |
| Volume: 4 |
| Issue: 3 |
| DOI: 10.1002/adhm.201400291 |
| Published: FEB 18 2015 |
| Abstract: The design and synthesis of a polyphenylene dendrimer (PPD 3) with discrete binding sites for lipophilic guest molecules and characteristic surface patterns is presented. Its semi-rigidity in combination with a precise positioning of hydrophilic and hydrophobic groups at the periphery yields a refined architecture with lipophilic binding pockets that accommodate defined numbers of biologically relevant guest molecules such as fatty acids or the drug doxorubicin. The size, architecture, and surface textures allow to even penetrate brain endothelial cells that are a major component of the extremely tight blood-brain barrier. In addition, low to no toxicity is observed in in vivo studies using zebrafish embryos. The unique PPD scaffold allows the precise placement of functional groups in a given environment and offers a universal platform for designing drug transporters that closely mimic many features of proteins. |
| Accession Number: WOS:000349961600005 |
| PubMed ID: 25182694 |
| Record 169 of 225 |
| By: Romach, Y (Romach, Y.); Muller, C (Mueller, C.); Unden, T (Unden, T.); Rogers, LJ (Rogers, L. J.); Isoda, T (Isoda, T.); Itoh, KM (Itoh, K. M.); Markham, M (Markham, M.); Stacey, A (Stacey, A.); Meijer, J (Meijer, J.); Pezzagna, S (Pezzagna, S.); Naydenov, B (Naydenov, B.); McGuinness, LP (McGuinness, L. P.); Bar-Gill, N (Bar-Gill, N.); Jelezko, F (Jelezko, F.) |
| Title: Spectroscopy of Surface-Induced Noise Using Shallow Spins in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 114 |
| Issue: 1 |
| Article Number: 017601 |
| DOI: 10.1103/PhysRevLett.114.017601 |
| Published: JAN 6 2015 |
| Abstract: We report on the noise spectrum experienced by few nanometer deep nitrogen-vacancy centers in diamond as a function of depth, surface coating, magnetic field and temperature. Analysis reveals a double-Lorentzian noise spectrum consistent with a surface electronic spin bath in the low frequency regime, along with a faster noise source attributed to surface-modified phononic coupling. These results shed new light on the mechanisms responsible for surface noise affecting shallow spins at semiconductor interfaces, and suggests possible directions for further studies. We demonstrate dynamical decoupling from the surface noise, paving the way to applications ranging from nanoscale NMR to quantum networks. |
| Accession Number: WOS:000352068300022 |
| PubMed ID: 25615501 |
| Record 170 of 225 |
| By: Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Edited by: Kapusta, P (Kapusta, P); Wahl, M (Wahl, M); Erdmann, R (Erdmann, R) |
| Title: Single-Color Centers in Diamond as Single-Photon Sources and Quantum Sensors |
| Source: ADVANCED PHOTON COUNTING: APPLICATIONS, METHODS, INSTRUMENTATION |
| Book Series Title: Springer Series on Fluorescence |
| Volume: 15 |
| Pages: 303-318 |
| DOI: 10.1007/4243_2014_78 |
| Published: 2015 |
| Abstract: Single quantum systems in the solid state have a potential application for quantum information processing. Among these, color defects in diamond seem to be the most promising ones, as they can operate at ambient conditions. In this chapter the optical and spin properties of the widely investigated nitrogen-vacancy (NV) and silicon-vacancy (SiV) centers in diamonds will be reviewed. We will present the latest experiments showing their application as single-photon sources, qubits, and sensitive magnetic field sensors with nanometer spatial resolution. |
| Accession Number: WOS:000482950200015 |
| Book DOI: 10.1007/978-3-319-15636-1 |
| Record 171 of 225 |
| By: Rogers, LJ (Rogers, Lachlan J.); Jahnke, KD (Jahnke, Kay D.); Metsch, MH (Metsch, Mathias H.); Sipahigil, A (Sipahigil, Alp); Binder, JM (Binder, Jan M.); Teraji, T (Teraji, Tokuyuki); Sumiya, H (Sumiya, Hitoshi); Isoya, J (Isoya, Junichi); Lukin, MD (Lukin, Mikhail D.); Hemmer, P (Hemmer, Philip); Jelezko, F (Jelezko, Fedor) |
| Title: All-Optical Initialization, Readout, and Coherent Preparation of Single Silicon-Vacancy Spins in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 113 |
| Issue: 26 |
| Article Number: 263602 |
| DOI: 10.1103/PhysRevLett.113.263602 |
| Published: DEC 22 2014 |
| Abstract: The silicon-vacancy (SiV-) color center in diamond has attracted attention because of its unique optical properties. It exhibits spectral stability and indistinguishability that facilitate efficient generation of photons capable of demonstrating quantum interference. Here we show optical initialization and readout of electronic spin in a single SiV- center with a spin relaxation time of T-1 = 2.4 +/- 0.2 ms. Coherent population trapping (CPT) is used to demonstrate coherent preparation of dark superposition states with a spin coherence time of T-2* = 35 +/- 3 ns. This is fundamentally limited by orbital relaxation, and an understanding of this process opens the way to extend coherence by engineering interactions with phonons. Hyperfine structure is observed in CPT measurements with the Si-29 isotope which allows access to nuclear spin. These results establish the SiV-center as a solid-state spin-photon interface. |
| Accession Number: WOS:000346836900005 |
| PubMed ID: 25615330 |
| Record 172 of 225 |
| By: Haussler, AJ (Haeussler, Andreas J.); Heller, P (Heller, Pascal); McGuinness, LP (McGuinness, Liam P.); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Optical depth localization of nitrogen-vacancy centers in diamond with nanometer accuracy |
| Source: OPTICS EXPRESS |
| Volume: 22 |
| Issue: 24 |
| Pages: 29986-29995 |
| DOI: 10.1364/OE.22.029986 |
| Published: DEC 1 2014 |
| Abstract: Precise positioning of nitrogen-vacancy (NV) centers is crucial for their application in sensing and quantum information. Here we present a new purely optical technique enabling determination of the NV position with nanometer resolution. We use a confocal microscope to determine the position of individual emitters along the optical axis. Using two separate detection channels, it is possible to simultaneously measure reflected light from the diamond surface and fluorescent light from the NV center and statistically evaluate both signals. An accuracy of 2.6 nm for shallow NV centers was achieved and is consistent with other techniques for depth determination. (C) 2014 Optical Society of America |
| Accession Number: WOS:000345770500066 |
| PubMed ID: 25606928 |
| Record 173 of 225 |
| By: Dietrich, A (Dietrich, Andreas); Jahnke, KD (Jahnke, Kay D.); Binder, JM (Binder, Jan M.); Teraji, T (Teraji, Tokuyuki); Isoya, J (Isoya, Junichi); Rogers, LJ (Rogers, Lachlan J.); Jelezko, F (Jelezko, Fedor) |
| Title: Isotopically varying spectral features of silicon-vacancy in diamond |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 16 |
| Article Number: 113019 |
| DOI: 10.1088/1367-2630/16/11/113019 |
| Published: NOV 11 2014 |
| Abstract: The silicon-vacancy centre (SiV-) in diamond has exceptional spectral properties for single-emitter quantum information applications. Most of the fluorescence is concentrated in a strong zero phonon line (ZPL), with a weak phonon sideband extending for 100 nm that contains several clear features. We demonstrate that the ZPL position can be used to reliably identify the silicon isotope present in a single SiV- centre. This is of interest for quantum information applications since only the Si-29 isotope has nuclear spin. In addition, we show that the sharp 64 meV phonon peak is due to a local vibrational mode of the silicon atom. The presence of a local mode suggests a plausible origin of the measured isotopic shift of the ZPL. |
| Accession Number: WOS:000346713600001 |
| Record 174 of 225 |
| By: Tamura, S (Tamura, Syuto); Koike, G (Koike, Godai); Komatsubara, A (Komatsubara, Akira); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); McGuinness, LP (McGuinness, Liam P.); Rogers, L (Rogers, Lachlan); Naydenov, B (Naydenov, Boris); Wu, E (Wu, E.); Yan, L (Yan, Liu); Jelezko, F (Jelezko, Fedor); Ohshima, T (Ohshima, Takeshi); Isoya, J (Isoya, Junichi); Shinada, T (Shinada, Takahiro); Tanii, T (Tanii, Takashi) |
| Title: Array of bright silicon-vacancy centers in diamond fabricated by low-energy focused ion beam implantation |
| Source: APPLIED PHYSICS EXPRESS |
| Volume: 7 |
| Issue: 11 |
| Article Number: 115201 |
| DOI: 10.7567/APEX.7.115201 |
| Published: NOV 2014 |
| Abstract: Among promising color centers for single-photon sources in diamond, the negatively charged silicon-vacancy (SiV-) has 70% of its emission to the zero-phonon line (ZPL), in contrast to the negatively charged nitrogen vacancy (NV-), which has a broad spectrum. Fabricating single centers of useful defect complexes with high yield and excellent grown-in defect properties by ion implantation has proven to be challenging. We have fabricated bright single SiV- centers by 60-keV focused ion beam implantation and subsequent annealing at 1000 degrees C with high positioning accuracy and a high yield of 15%. (C) 2014 The Japan Society of Applied Physics |
| Accession Number: WOS:000346119500039 |
| Record 175 of 225 |
| By: Scheuer, J (Scheuer, Jochen); Kong, X (Kong, Xi); Said, RS (Said, Ressa S.); Chen, J (Chen, Jeson); Kurz, A (Kurz, Andrea); Marseglia, L (Marseglia, Luca); Du, JF (Du, Jiangfeng); Hemmer, PR (Hemmer, Philip R.); Montangero, S (Montangero, Simone); Calarco, T (Calarco, Tommaso); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Precise qubit control beyond the rotating wave approximation |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 16 |
| Article Number: 093022 |
| DOI: 10.1088/1367-2630/16/9/093022 |
| Published: SEP 19 2014 |
| Abstract: Fast and accurate quantum operations of a single spin in room-temperature solids are required in many modern scientific areas, for instance in quantum information, quantum metrology, and magnetometry. However, the accuracy is limited if the Rabi frequency of the control is comparable with the transition frequency of the qubit due to the breakdown of the rotating wave approximation (RWA). We report here an experimental implementation of a control method based on quantum optimal control theory which does not suffer from such restriction. We demonstrate the most commonly used single qubit rotations, i.e. pi/2- and pi-pulses, beyond the RWA regime with high fidelity F-pi/2(exp) = 0.95 +/- 0.01 and F-pi(exp) = 0.99 +/- 0.016, respectively. They are in excellent agreement with the theoretical predictions, F-pi/2(theory) = 0.9545 and F-pi(theory) = 0.9986. Furthermore, we perform two basic magnetic resonance experiments both in the rotating and the laboratory frames, where we are able to deliberately 'switch' between the frames, to confirm the robustness of our control method. Our method is general, hence it may immediately find its wide applications in magnetic resonance, quantum computing, quantum optics, and broadband magnetometry. |
| Accession Number: WOS:000342051400001 |
| Record 176 of 225 |
| By: Sipahigil, A (Sipahigil, A.); Jahnke, KD (Jahnke, K. D.); Rogers, LJ (Rogers, L. J.); Teraji, T (Teraji, T.); Isoya, J (Isoya, J.); Zibrov, AS (Zibrov, A. S.); Jelezko, F (Jelezko, F.); Lukin, MD (Lukin, M. D.) |
| Title: Indistinguishable Photons from Separated Silicon-Vacancy Centers in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 113 |
| Issue: 11 |
| Article Number: 113602 |
| DOI: 10.1103/PhysRevLett.113.113602 |
| Published: SEP 11 2014 |
| Abstract: We demonstrate that silicon-vacancy (SiV) centers in diamond can be used to efficiently generate coherent optical photons with excellent spectral properties. We show that these features are due to the inversion symmetry associated with SiV centers. The generation of indistinguishable single photons from separated emitters at 5 K is demonstrated in a Hong-Ou-Mandel interference experiment. Prospects for realizing efficient quantum network nodes using SiV centers are discussed. |
| Accession Number: WOS:000341914100006 |
| PubMed ID: 25259977 |
| Record 177 of 225 |
| By: Albrecht, A (Albrecht, A.); Koplovitz, G (Koplovitz, G.); Retzker, A (Retzker, A.); Jelezko, F (Jelezko, F.); Yochelis, S (Yochelis, S.); Porath, D (Porath, D.); Nevo, Y (Nevo, Y.); Shoseyov, O (Shoseyov, O.); Paltiel, Y (Paltiel, Y.); Plenio, MB (Plenio, M. B.) |
| Title: Self-assembling hybrid diamond-biological quantum devices |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 16 |
| Article Number: 093002 |
| DOI: 10.1088/1367-2630/16/9/093002 |
| Published: SEP 4 2014 |
| Abstract: The realization of scalable arrangements of nitrogen vacancy (NV) centers in diamond remains a key challenge on the way towards efficient quantum information processing, quantum simulation and quantum sensing applications. Although technologies based on implanting NV-centers in bulk diamond crystals or hybrid device approaches have been developed, they are limited by the achievable spatial resolution and by the intricate technological complexities involved in achieving scalability. We propose and demonstrate a novel approach for creating an arrangement of NV-centers, based on the self-assembling capabilities of biological systems and their beneficial nanometer spatial resolution. Here, a self-assembled protein structure serves as a structural scaffold for surface functionalized nanodiamonds, in this way allowing for the controlled creation of NV-structures on the nanoscale and providing a new avenue towards bridging the bio-nano interface. One-, two- as well as three-dimensional structures are within the scope of biological structural assembling techniques. We realized experimentally the formation of regular structures by interconnecting nanodiamonds using biological protein scaffolds. Based on the achievable NV-center distances of 11 nm, we evaluate the expected dipolar coupling interaction with neighboring NV-centers as well as the expected decoherence time. Moreover, by exploiting these couplings, we provide a detailed theoretical analysis on the viability of multiqubit quantum operations, suggest the possibility of individual addressing based on the random distribution of the NV intrinsic symmetry axes and address the challenges posed by decoherence and imperfect couplings. We then demonstrate in the last part that our scheme allows for the high-fidelity creation of entanglement, cluster states and quantum simulation applications. |
| Accession Number: WOS:000342050300002 |
| Record 178 of 225 |
| By: Yamamoto, T (Yamamoto, T.); Onoda, S (Onoda, S.); Ohshima, T (Ohshima, T.); Teraji, T (Teraji, T.); Watanabe, K (Watanabe, K.); Koizumi, S (Koizumi, S.); Umeda, T (Umeda, T.); McGuinness, LP (McGuinness, L. P.); Muller, C (Mueller, C.); Naydenov, B (Naydenov, B.); Dolde, F (Dolde, F.); Fedder, H (Fedder, H.); Honert, J (Honert, J.); Markham, ML (Markham, M. L.); Twitchen, DJ (Twitchen, D. J.); Wrachtrup, J (Wrachtrup, J.); Jelezko, F (Jelezko, F.); Isoya, J (Isoya, J.) |
| Title: Isotopic identification of engineered nitrogen-vacancy spin qubits in ultrapure diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 90 |
| Issue: 8 |
| Article Number: 081117 |
| DOI: 10.1103/PhysRevB.90.081117 |
| Published: AUG 29 2014 |
| Abstract: Nitrogen impurities help to stabilize the negatively-charged-state of NV- in diamond, whereas magnetic fluctuations from nitrogen spins lead to decoherence of NV- qubits. It is not known what donor concentration optimizes these conflicting requirements. Here we used 10-MeV N-15(3+) ion implantation to create NV- in ultrapure diamond. Optically detected magnetic resonance of single centers revealed a high creation yield of 40 +/- 3% from N-15(3+) ions and an additional yield of 56 +/- 3% from N-14 impurities. High-temperature anneal was used to reduce residual defects, and charge stable NV-, even in a dilute N-14 impurity concentration of 0.06 ppb were created with long coherence times. |
| Accession Number: WOS:000341027200001 |
| Record 179 of 225 |
| By: Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya); Pushkarchuk, AL (Pushkarchuk, A. L.); Pushkarchuk, VA (Pushkarchuk, V. A.); Jelezko, F (Jelezko, F.) |
| Title: Theoretical study of hyperfine interactions and optically detected magnetic resonance spectra by simulation of the C-291[NV]H--(172) diamond cluster hosting nitrogen-vacancy center |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 16 |
| Article Number: 083014 |
| DOI: 10.1088/1367-2630/16/8/083014 |
| Published: AUG 7 2014 |
| Abstract: Single nitrogen-vacancy (NV) centers in diamond coupled to neighboring nuclear spins are promising candidates for room-temperature applications in quantum information processing, quantum sensing and metrology. Here we report on a systematic density functional theory simulation of hyperfine coupling of the electronic spin of the NV center to individual C-13 nuclear spins arbitrarily disposed in the H-terminated C-291[NV]H--(172) cluster hosting the NV center. For the 'families' of equivalent positions of the C-13 atom in diamond lattices around the NV center we calculated hyperfine characteristics. For the first time the data are given for a system where the C-13 atom is located on the NV center symmetry axis. Electron paramagnetic resonance transitions in the coupled electron-nuclear spin system (NV)-N-14-C-13 are analyzed as a function of the external magnetic field. Previously reported experimental data from Dreau et al (2012 Phys. Rev. B 85 134107) are described using simulated hyperfine coupling parameters. |
| Accession Number: WOS:000341918700001 |
| Record 180 of 225 |
| By: Muller, C (Mueller, C.); Kong, X (Kong, X.); Cai, JM (Cai, J. -M.); Melentijevic, K (Melentijevic, K.); Stacey, A (Stacey, A.); Markham, M (Markham, M.); Twitchen, D (Twitchen, D.); Isoya, J (Isoya, J.); Pezzagna, S (Pezzagna, S.); Meijer, J (Meijer, J.); Du, JF (Du, J. F.); Plenio, MB (Plenio, M. B.); Naydenov, B (Naydenov, B.); McGuinness, LP (McGuinness, L. P.); Jelezko, F (Jelezko, F.) |
| Title: Nuclear magnetic resonance spectroscopy with single spin sensitivity |
| Source: NATURE COMMUNICATIONS |
| Volume: 5 |
| Article Number: 4703 |
| DOI: 10.1038/ncomms5703 |
| Published: AUG 2014 |
| Abstract: Nuclear magnetic resonance spectroscopy and magnetic resonance imaging at the ultimate sensitivity limit of single molecules or single nuclear spins requires fundamentally new detection strategies. The strong coupling regime, when interaction between sensor and sample spins dominates all other interactions, is one such strategy. In this regime, classically forbidden detection of completely unpolarized nuclei is allowed, going beyond statistical fluctuations in magnetization. Here we realize strong coupling between an atomic (nitrogen-vacancy) sensor and sample nuclei to perform nuclear magnetic resonance on four Si-29 spins. We exploit the field gradient created by the diamond atomic sensor, in concert with compressed sensing, to realize imaging protocols, enabling individual nuclei to be located with Angstrom precision. The achieved signal-to-noise ratio under ambient conditions allows single nuclear spin sensitivity to be achieved within seconds. |
| Accession Number: WOS:000341078900001 |
| PubMed ID: 25146503 |
| Record 181 of 225 |
| By: Rogers, LJ (Rogers, L. J.); Jahnke, KD (Jahnke, K. D.); Teraji, T (Teraji, T.); Marseglia, L (Marseglia, L.); Muller, C (Mueller, C.); Naydenov, B (Naydenov, B.); Schauffert, H (Schauffert, H.); Kranz, C (Kranz, C.); Isoya, J (Isoya, J.); McGuinness, LP (McGuinness, L. P.); Jelezko, F (Jelezko, F.) |
| Title: Multiple intrinsically identical single-photon emitters in the solid state |
| Source: NATURE COMMUNICATIONS |
| Volume: 5 |
| Article Number: 4739 |
| DOI: 10.1038/ncomms5739 |
| Published: AUG 2014 |
| Abstract: Emitters of indistinguishable single photons are crucial for the growing field of quantum technologies. To realize scalability and increase the complexity of quantum optics technologies, multiple independent yet identical single-photon emitters are required. However, typical solid-state single-photon sources are inherently dissimilar, necessitating the use of electrical feedback or optical cavities to improve spectral overlap between distinct emitters. Here we demonstrate bright silicon vacancy (SiV-) centres in low-strain bulk diamond, which show spectral overlap of up to 91% and nearly transform-limited excitation linewidths. This is the first time that distinct single-photon emitters in the solid state have shown intrinsically identical spectral properties. Our results have impact on the application of single-photon sources for quantum optics and cryptography. |
| Accession Number: WOS:000341081300002 |
| PubMed ID: 25162729 |
| Record 182 of 225 |
| By: London, P (London, P.); Balasubramanian, P (Balasubramanian, P.); Naydenov, B (Naydenov, B.); McGuinness, LP (McGuinness, L. P.); Jelezko, F (Jelezko, F.) |
| Title: Strong driving of a single spin using arbitrarily polarized fields |
| Source: PHYSICAL REVIEW A |
| Volume: 90 |
| Issue: 1 |
| Article Number: 012302 |
| DOI: 10.1103/PhysRevA.90.012302 |
| Published: JUL 2 2014 |
| Abstract: The strong-driving regime occurs when a quantum two-level system is driven with an external field whose amplitude is greater than or equal to the energy splitting between the system's states and is typically identified with the breaking of the rotating wave approximation (RWA). We report an experimental study in which the spin of a single nitrogen-vacancy (NV) center in diamond is strongly driven with microwave fields of arbitrary polarization. We measure the NV center spin dynamics beyond the RWA and characterize the limitations of this technique for generating high-fidelity quantum gates. Using circularly polarized microwave fields, the NV spin can be harmonically driven in its rotating frame regardless of the field amplitude, thus allowing rotations around arbitrary axes. Our approach can effectively remove the RWA limit in quantum-sensing schemes and assist in increasing the number of operations in QIP protocols. |
| Accession Number: WOS:000338649000005 |
| Record 183 of 225 |
| By: Rogers, LJ (Rogers, Lachlan J.); Jahnke, KD (Jahnke, Kay D.); Doherty, MW (Doherty, Marcus W.); Dietrich, A (Dietrich, Andreas); McGuinness, LP (McGuinness, Liam P.); Muller, C (Mueller, Christoph); Teraji, T (Teraji, Tokuyuki); Sumiya, H (Sumiya, Hitoshi); Isoya, J (Isoya, Junichi); Manson, NB (Manson, Neil B.); Jelezko, F (Jelezko, Fedor) |
| Title: Electronic structure of the negatively charged silicon-vacancy center in diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 89 |
| Issue: 23 |
| Article Number: 235101 |
| DOI: 10.1103/PhysRevB.89.235101 |
| Published: JUN 2 2014 |
| Abstract: The negatively charged silicon-vacancy (SiV-) center in diamond is a promising single-photon source for quantum communications and information processing. However, the center's implementation in such quantum technologies is hindered by contention surrounding its fundamental properties. Here we present optical polarization measurements of single centers in bulk diamond that resolve this state of contention and establish that the center has a < 111 > aligned split-vacancy structure with D-3d symmetry. Furthermore, we identify an additional electronic level and evidence for the presence of dynamic Jahn-Teller effects in the center's 738-nm optical resonance. |
| Accession Number: WOS:000337274700001 |
| Record 184 of 225 |
| By: Cai, J (Cai, Jianming); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.) |
| Title: Hybrid sensors based on colour centres in diamond and piezoactive layers |
| Source: NATURE COMMUNICATIONS |
| Volume: 5 |
| Article Number: 4065 |
| DOI: 10.1038/ncomms5065 |
| Published: JUN 2014 |
| Abstract: The ability to measure weak signals such as pressure, force, electric field and temperature with nanoscale devices and high spatial resolution offers a wide range of applications in fundamental and applied sciences. Here we present a proposal for a hybrid device composed of thin film layers of diamond with colour centres and piezoactive elements for the transduction and measurement of physical signals. The magnetic response of a piezomagnetic layer to an external stress or a stress induced by a signal is shown to affect significantly the spin properties of nitrogen-vacancy centres in diamond. Under ambient conditions, realistic environmental noise and material imperfections, we show that this hybrid device can achieve significant improvements in sensitivity over the pure diamond-based approach in combination with nanometre-scale spatial resolution. Furthermore, the proposed hybrid architecture offers novel possibilities for engineering strong coherent couplings between nanomechanical oscillator and solid state spin qubits. |
| Accession Number: WOS:000338838000009 |
| PubMed ID: 24909637 |
| Record 185 of 225 |
| By: Dolde, F (Dolde, Florian); Doherty, MW (Doherty, Marcus W.); Michl, J (Michl, Julia); Jakobi, I (Jakobi, Ingmar); Naydenov, B (Naydenov, Boris); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Neumann, P (Neumann, Philipp); Jelezko, F (Jelezko, Fedor); Manson, NB (Manson, Neil B.); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Nanoscale Detection of a Single Fundamental Charge in Ambient Conditions Using the NV- Center in Diamond |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 112 |
| Issue: 9 |
| Article Number: 097603 |
| DOI: 10.1103/PhysRevLett.112.097603 |
| Published: MAR 3 2014 |
| Abstract: Single charge nanoscale detection in ambient conditions is a current frontier in metrology that has diverse interdisciplinary applications. Here, such single charge detection is demonstrated using two nitrogen-vacancy (NV) centers in diamond. One NV center is employed as a sensitive electrometer to detect the change in electric field created by the displacement of a single electron resulting from the optical switching of the other NV center between its neutral (NV0) and negative (NV-) charge states. As a consequence, our measurements also provide direct insight into the charge dynamics inside the material. |
| Accession Number: WOS:000332169000013 |
| PubMed ID: 24655277 |
| Record 186 of 225 |
| By: Dolde, F (Dolde, Florian); Bergholm, V (Bergholm, Ville); Wang, Y (Wang, Ya); Jakobi, I (Jakobi, Ingmar); Naydenov, B (Naydenov, Boris); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Neumann, P (Neumann, Philipp); Schulte-Herbruggen, T (Schulte-Herbrueggen, Thomas); Biamonte, J (Biamonte, Jacob); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: High-fidelity spin entanglement using optimal control |
| Source: NATURE COMMUNICATIONS |
| Volume: 5 |
| Article Number: 3371 |
| DOI: 10.1038/ncomms4371 |
| Published: FEB 2014 |
| Abstract: Precise control of quantum systems is of fundamental importance in quantum information processing, quantum metrology and high-resolution spectroscopy. When scaling up quantum registers, several challenges arise: individual addressing of qubits while suppressing crosstalk, entangling distant nodes and decoupling unwanted interactions. Here we experimentally demonstrate optimal control of a prototype spin qubit system consisting of two proximal nitrogen-vacancy centres in diamond. Using engineered microwave pulses, we demonstrate single electron spin operations with a fidelity F approximate to 0.99. With additional dynamical decoupling techniques, we further realize high-quality, on-demand entangled states between two electron spins with F > 0.82, mostly limited by the coherence time and imperfect initialization. Crosstalk in a crowded spectrum and unwanted dipolar couplings are simultaneously eliminated to a high extent. Finally, by high-fidelity entanglement swapping to nuclear spin quantum memory, we demonstrate nuclear spin entanglement over a length scale of 25 nm. This experiment underlines the importance of optimal control for scalable room temperature spin-based quantum information devices. |
| Accession Number: WOS:000332669900007 |
| PubMed ID: 24584174 |
| Record 187 of 225 |
| By: Antonov, D (Antonov, D.); Haussermann, T (Haeussermann, T.); Aird, A (Aird, A.); Roth, J (Roth, J.); Trebin, HR (Trebin, H-R); Muller, C (Mueller, C.); McGuinness, L (McGuinness, L.); Jelezko, F (Jelezko, F.); Yamamoto, T (Yamamoto, T.); Isoya, J (Isoya, J.); Pezzagna, S (Pezzagna, S.); Meijer, J (Meijer, J.); Wrachtrup, J (Wrachtrup, J.) |
| Title: Statistical investigations on nitrogen-vacancy center creation |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 104 |
| Issue: 1 |
| Article Number: 012105 |
| DOI: 10.1063/1.4860997 |
| Published: JAN 6 2014 |
| Abstract: Quantum information technologies require networks of interacting defect bits. Color centers, especially the nitrogen vacancy (NV-) center in diamond, represent one promising avenue, toward the realisation of such devices. The most successful technique for creating NV- in diamond is ion implantation followed by annealing. Previous experiments have shown that shallow nitrogen implantation (<10 keV) results in NV- centers with a yield of 0.01%-0.1%. We investigate the influence of channeling effects during shallow implantation and statistical diffusion of vacancies using molecular dynamics and Monte Carlo simulation techniques. Energy barriers for the diffusion process were calculated using density functional theory. Our simulations show that 25% of the implanted nitrogens form a NV center, which is in good agreement with our experimental findings. (C) 2014 AIP Publishing LLC. |
| Accession Number: WOS:000329838800036 |
| Record 188 of 225 |
| By: Vlasov, II (Vlasov, Igor I.); Shiryaev, AA (Shiryaev, Andrey A.); Rendler, T (Rendler, Torsten); Steinert, S (Steinert, Steffen); Lee, SY (Lee, Sang-Yun); Antonov, D (Antonov, Denis); Voros, M (Voeroes, Marton); Jelezko, F (Jelezko, Fedor); Fisenko, AV (Fisenko, Anatolii V.); Semjonova, LF (Semjonova, Lubov F.); Biskupek, J (Biskupek, Johannes); Kaiser, U (Kaiser, Ute); Lebedev, OI (Lebedev, Oleg I.); Sildos, I (Sildos, Ilmo); Hemmer, PR (Hemmer, Philip. R.); Konov, VI (Konov, Vitaly I.); Gali, A (Gali, Adam); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Molecular-sized fluorescent nanodiamonds |
| Source: NATURE NANOTECHNOLOGY |
| Volume: 9 |
| Issue: 1 |
| Pages: 54-58 |
| DOI: 10.1038/NNANO.2013.255 |
| Published: JAN 2014 |
| Abstract: Doping of carbon nanoparticles with impurity atoms is central to their application(1,2). However, doping has proven elusive for very small carbon nanoparticles because of their limited availability and a lack of fundamental understanding of impurity stability in such nanostructures(3). Here, we show that isolated diamond nanoparticles as small as 1.6 nm, comprising only similar to 400 carbon atoms, are capable of housing stable photoluminescent colour centres, namely the silicon vacancy (SiV)(4,5). Surprisingly, fluorescence from SiVs is stable over time, and few or only single colour centres are found per nanocrystal. We also observe size-dependent SiV emission supported by quantum-chemical simulation of SiV energy levels in small nanodiamonds. Our work opens the way to investigating the physics and chemistry of molecular-sized cubic carbon clusters and promises the application of ultrasmall non-perturbative fluorescent nanoparticles as markers in microscopy and sensing. |
| Accession Number: WOS:000329315000015 |
| PubMed ID: 24317283 |
| Record 189 of 225 |
| By: Shinada, T (Shinada, Takahiro); Enrico, P (Enrico, Prati); Tamura, S (Tamura, Syuto); Tanii, T (Tanii, Takashi); Teraji, T (Teraji, Tokuyuki); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); McGuinness, LP (McGuinness, Liam P.); Rogers, L (Rogers, Lachlan); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Isoya, J (Isoya, Junichi) |
| Book Group Author(s): IEEE |
| Title: Opportunity of single atom control for quantum processing in silicon and diamond |
| Source: 2014 IEEE SILICON NANOELECTRONICS WORKSHOP (SNW) |
| Book Series Title: IEEE Silicon Nanoelectronics Workshop |
| Published: 2014 |
| Abstract: Future CMOS will require the placement of dopants in a predetermined location, namely, a single atom control. Deterministic doping method, i.e. single-ion implantation, realizes ordered arrays of single-atoms in silicon, diamond and other materials, which might provide opportunities to single-dopant transport or single-photon source beneficial to quantum processing. |
| Conference Title: IEEE Silicon Nanoelectronics Workshop (SNW) |
| Conference Date: JUN 08-09, 2014 |
| Conference Location: Honolulu, HI |
| Sponsor(s): IEEE |
| Accession Number: WOS:000393376800009 |
| Record 190 of 225 |
| By: Jelezko, F (Jelezko, Fedor) |
| Title: Nanodiamonds sense iron in blood |
| Source: TRAC-TRENDS IN ANALYTICAL CHEMISTRY |
| Volume: 52 |
| Special Issue: SI |
| Pages: VII-VIII |
| Published: DEC 2013 |
| Accession Number: WOS:000328804100005 |
| Record 191 of 225 |
| By: Osterkamp, C (Osterkamp, Christian); Scharpf, J (Scharpf, Jochen); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Diemant, T (Diemant, Thomas); Behm, RJ (Behm, Rolf Juergen); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor) |
| Title: Increasing the creation yield of shallow single defects in diamond by surface plasma treatment |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 103 |
| Issue: 19 |
| Article Number: 193118 |
| DOI: 10.1063/1.4829875 |
| Published: NOV 4 2013 |
| Abstract: Single Nitrogen-Vacancy (NV) centers in diamond close to the crystal surface are very promising magnetic field sensors with very high sensitivity. Here, we report the enhanced creation of very shallow (less than 3 nm below the diamond surface) NV centers by using fluorine and oxygen plasma treatment. We observe a four fold increase-from 0.11% to about 0.45% in the production yield when the sample surface is terminated with fluorine or oxygen atoms. This effect is explained by the stabilization of the NV's negative charge state which is influenced by the various defects present on the diamond surface. (C) 2013 AIP Publishing LLC. |
| Accession Number: WOS:000327817000077 |
| Record 192 of 225 |
| By: Yamamoto, T (Yamamoto, Takashi); Muller, C (Mueller, Christoph); McGuinness, LP (McGuinness, Liam P.); Teraji, T (Teraji, Tokuyuki); Naydenov, B (Naydenov, Boris); Onoda, S (Onoda, Shinobu); Ohshima, T (Ohshima, Takeshi); Wrachtrup, J (Wrachtrup, Joerg); Jelezko, F (Jelezko, Fedor); Isoya, J (Isoya, Junichi) |
| Title: Strongly coupled diamond spin qubits by molecular nitrogen implantation |
| Source: PHYSICAL REVIEW B |
| Volume: 88 |
| Issue: 20 |
| Article Number: 201201 |
| DOI: 10.1103/PhysRevB.88.201201 |
| Published: NOV 4 2013 |
| Abstract: Ionized nitrogen molecules (N-15(2)+) are used as efficient point sources for creating NV- pairs in diamond with nanoscale spatial separation and up to 55 kHz magnetic coupling strength. Co-implantation of C-12(+) increased the yield of pairs, and a C-13-depleted diamond allowed 0.65 ms coherence times to be obtained. Further coupling to a third dark spin provided a strongly coupled three-spin register. These results mark an important step towards realization of multiqubit systems and scalable NV- quantum registers. |
| Accession Number: WOS:000326508800002 |
| Record 193 of 225 |
| By: Yamamoto, T (Yamamoto, T.); Umeda, T (Umeda, T.); Watanabe, K (Watanabe, K.); Onoda, S (Onoda, S.); Markham, ML (Markham, M. L.); Twitchen, DJ (Twitchen, D. J.); Naydenov, B (Naydenov, B.); McGuinness, LP (McGuinness, L. P.); Teraji, T (Teraji, T.); Koizumi, S (Koizumi, S.); Dolde, F (Dolde, F.); Fedder, H (Fedder, H.); Honert, J (Honert, J.); Wrachtrup, J (Wrachtrup, J.); Ohshima, T (Ohshima, T.); Jelezko, F (Jelezko, F.); Isoya, J (Isoya, J.) |
| Title: Extending spin coherence times of diamond qubits by high-temperature annealing |
| Source: PHYSICAL REVIEW B |
| Volume: 88 |
| Issue: 7 |
| Article Number: 075206 |
| DOI: 10.1103/PhysRevB.88.075206 |
| Published: AUG 23 2013 |
| Abstract: Spins of negatively charged nitrogen-vacancy (NV-) defects in diamond are among the most promising candidates for solid-state qubits. The fabrication of quantum devices containing these spin-carrying defects requires position-controlled introduction of NV- defects having excellent properties such as spectral stability, a long spin coherence time, and a stable negative charge state. Nitrogen ion implantation and annealing enable the positioning of NV- spin qubits with high precision, but to date, the coherence times of qubits produced this way are short, presumably because of the presence of residual radiation damage. In the present work, we demonstrate that a high-temperature annealing at 1000 degrees C allows 2 ms coherence times to be achieved at room temperature. These results were obtained for implantation-produced NV- defects in a high-purity, 99.99% C-12-enriched single crystal chemical vapor deposited diamond. We discuss these long coherence times in the context of the thermal behavior of residual defect spins. |
| Accession Number: WOS:000323571500003 |
| Record 194 of 225 |
| By: Albrecht, A (Albrecht, A.); Retzker, A (Retzker, A.); Jelezko, F (Jelezko, F.); Plenio, MB (Plenio, M. B.) |
| Title: Coupling of nitrogen vacancy centres in nanodiamonds by means of phonons |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 15 |
| Article Number: 083014 |
| DOI: 10.1088/1367-2630/15/8/083014 |
| Published: AUG 6 2013 |
| Abstract: Realizing controlled quantum dynamics via the magnetic interactions between colour centres in diamond remains a challenge despite recent demonstrations for nanometre separated pairs. Here we propose to use the intrinsic acoustical phonons in diamond as a data bus for accomplishing this task. We show that for nanodiamonds the electron-phonon coupling can take significant values that together with mode frequencies in the THz range can serve as a resource for conditional gate operations. Based on these results, we analyse how to use this phonon-induced interaction for constructing quantum gates among the electron-spin triplet ground states, introducing the phonon dependence via Raman transitions. Combined with decoupling pulses this offers the possibility for creating entangled states within nanodiamonds on the scale of several tens of nanometres, a promising prerequisite for quantum sensing applications. |
| Accession Number: WOS:000322756100004 |
| Record 195 of 225 |
| By: London, P (London, P.); Scheuer, J (Scheuer, J.); Cai, JM (Cai, J. -M.); Schwarz, I (Schwarz, I.); Retzker, A (Retzker, A.); Plenio, MB (Plenio, M. B.); Katagiri, M (Katagiri, M.); Teraji, T (Teraji, T.); Koizumi, S (Koizumi, S.); Isoya, J (Isoya, J.); Fischer, R (Fischer, R.); McGuinness, LP (McGuinness, L. P.); Naydenov, B (Naydenov, B.); Jelezko, F (Jelezko, F.) |
| Title: Detecting and Polarizing Nuclear Spins with Double Resonance on a Single Electron Spin |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 111 |
| Issue: 6 |
| Article Number: 067601 |
| DOI: 10.1103/PhysRevLett.111.067601 |
| Published: AUG 5 2013 |
| Abstract: We report the detection and polarization of nuclear spins in diamond at room temperature by using a single nitrogen-vacancy (NV) center. We use Hartmann-Hahn double resonance to coherently enhance the signal from a single nuclear spin while decoupling from the noisy spin bath, which otherwise limits the detection sensitivity. As a proof of principle, we (i) observe coherent oscillations between the NV center and a weakly coupled nuclear spin and (ii) demonstrate nuclear-bath cooling, which prolongs the coherence time of the NV sensor by more than a factor of 5. Our results provide a route to nanometer scale magnetic resonance imaging and novel quantum information processing protocols. |
| Accession Number: WOS:000322799200014 |
| PubMed ID: 23971612 |
| Record 196 of 225 |
| By: Boudou, JP (Boudou, Jean-Paul); Tisler, J (Tisler, Julia); Reuter, R (Reuter, Rolf); Thorel, A (Thorel, Alain); Curmi, PA (Curmi, Patrick A.); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Fluorescent nanodiamonds derived from HPHT with a size of less than 10 nm |
| Source: DIAMOND AND RELATED MATERIALS |
| Volume: 37 |
| Pages: 80-86 |
| DOI: 10.1016/j.diamond.2013.05.006 |
| Published: AUG 2013 |
| Abstract: The fabrication of fluorescent nanodiamonds by the electron irradiation of a high-pressure high-temperature microdiamond followed by annealing and fragmentation has a number of advantages over other fabrication approaches. High energy electron irradiation of micron-sized diamonds is a safe and convenient method to create vacancies within the lattice, thereby allowing for simple reactor designs. Well-defined annealing conditions facilitate vacancy migration and its subsequent capture by substitutional nitrogen (Ns) atoms, while avoiding the formation of unwanted coke on the surface of the diamond. In addition, microdiamonds offer a long vacancy migration path, which significantly increases the probability of vacancy trapping by nitrogen. In this report, we show that the fragmentation of irradiated and annealed microdiamonds creates round ultrasmall nanodiamonds composed of perfectly crystallized cubic-diamond nanocrystals, with fluorescent centers inside the nanocrystal core. Atomic force microscopy and confocal fluorescence microscopy demonstrate that approximately 30% of diamond nanocrystals with a size of less than 10 nm are fluorescent and have a remarkably long spin decoherence time (2.7 mu s for a 7 nm diamond nanocrystal). The presence of a high content of non-fluorescent ultrasmall nanodiamonds can be explained by the limited N concentration and its heterogeneous distribution in the initial raw high-pressure high-temperature diamond. The remarkably long spin decoherence time of the ultrasmall fluorescent nanodiamonds may be due to surface cleaning and nanodiamond fabrication procedures, which result in a low number of spin impurities in and around the nanocrystal. (C) 2013 Elsevier B.V. All rights reserved. |
| Accession Number: WOS:000321536900012 |
| Record 197 of 225 |
| By: McGuinness, LP (McGuinness, L. P.); Hall, LT (Hall, L. T.); Stacey, A (Stacey, A.); Simpson, DA (Simpson, D. A.); Hill, CD (Hill, C. D.); Cole, JH (Cole, J. H.); Ganesan, K (Ganesan, K.); Gibson, BC (Gibson, B. C.); Prawer, S (Prawer, S.); Mulvaney, P (Mulvaney, P.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.); Scholten, RE (Scholten, R. E.); Hollenberg, LCL (Hollenberg, L. C. L.) |
| Title: Ambient nanoscale sensing with single spins using quantum decoherence |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 15 |
| Article Number: 073042 |
| DOI: 10.1088/1367-2630/15/7/073042 |
| Published: JUL 23 2013 |
| Abstract: Magnetic resonance detection is one of the most important tools used in life-sciences today. However, as the technique detects the magnetization of large ensembles of spins it is fundamentally limited in spatial resolution to mesoscopic scales. Here we detect the natural fluctuations of nanoscale spin ensembles at ambient temperatures by measuring the decoherence rate of a single quantum spin in response to introduced extrinsic target spins. In our experiments 45 nm nanodiamonds with single nitrogen-vacancy (NV) spins were immersed in solution containing spin 5/2 Mn2+ ions and the NV decoherence rate measured though optically detected magnetic resonance. The presence of both freely moving and accreted Mn spins in solution were detected via significant changes in measured NV decoherence rates. Analysis of the data using a quantum cluster expansion treatment of the NV-target system found the measurements to be consistent with the detection of 2500 motionally diffusing Mn spins over an effective volume of (16 nm)(3) in 4.2 s, representing a reduction in target ensemble size and acquisition time of several orders of magnitude over conventional, magnetic induction approaches to electron spin resonance detection. These measurements provide the basis for the detection of nanovolume spins in solution, such as in the internal compartments of living cells, and are directly applicable to scanning probe architectures. |
| Accession Number: WOS:000322110600004 |
| Record 198 of 225 |
| By: Ermakova, A (Ermakova, A.); Pramanik, G (Pramanik, G.); Cai, JM (Cai, J. -M.); Algara-Siller, G (Algara-Siller, G.); Kaiser, U (Kaiser, U.); Weil, T (Weil, T.); Tzeng, YK (Tzeng, Y. -K.); Chang, HC (Chang, H. C.); McGuinness, LP (McGuinness, L. P.); Plenio, MB (Plenio, M. B.); Naydenov, B (Naydenov, B.); Jelezko, F (Jelezko, F.) |
| Title: Detection of a Few Metallo-Protein Molecules Using Color Centers in Nanodiamonds |
| Source: NANO LETTERS |
| Volume: 13 |
| Issue: 7 |
| Pages: 3305-3309 |
| DOI: 10.1021/nl4015233 |
| Published: JUL 2013 |
| Abstract: Nanometer-sized diamonds containing nitrogen-vacancy defect centers (NV) are promising nanosensors in biological environments due to their biocompatibility, bright fluorescence, and high magnetic sensitivity at ambient conditions. Here we report on the detection of ferritin molecules using magnetic noise induced by the inner paramagnetic iron as a contrast mechanism. We observe a significant reduction of both coherence and relaxation time due to the presence of ferritin on the surface of nanodiamonds. Our theoretical model is in excellent agreement with the experimental data and establishes this method as a novel sensing technology for proteins. |
| Accession Number: WOS:000321884300049 |
| PubMed ID: 23738579 |
| Record 199 of 225 |
| By: Doherty, MW (Doherty, Marcus W.); Manson, NB (Manson, Neil B.); Delaney, P (Delaney, Paul); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg); Hollenberg, LCL (Hollenberg, Lloyd C. L.) |
| Title: The nitrogen-vacancy colour centre in diamond |
| Source: PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS |
| Volume: 528 |
| Issue: 1 |
| Pages: 1-45 |
| DOI: 10.1016/j.physrep.2013.02.001 |
| Published: JUL 1 2013 |
| Abstract: The nitrogen-vacancy (NV) colour centre in diamond is an important physical system for emergent quantum technologies, including quantum metrology, information processing and communications, as well as for various nanotechnologies, such as biological and sub-diffraction limit imaging, and for tests of entanglement in quantum mechanics. Given this array of existing and potential applications and the almost 50 years of NV research, one would expect that the physics of the centre is well understood, however, the study of the NV centre has proved challenging, with many early assertions now believed false and many remaining issues yet to be resolved. This review represents the first time that the key empirical and ab initio results have been extracted from the extensive NV literature and assembled into one consistent picture of the current understanding of the centre. As a result, the key unresolved issues concerning the NV centre are identified and the possible avenues for their resolution are examined. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved. |
| Accession Number: WOS:000321078100001 |
| Record 200 of 225 |
| By: Shi, FZ (Shi, Fazhan); Zhang, Q (Zhang, Qi); Naydenov, B (Naydenov, Boris); Jelezko, F (Jelezko, Fedor); Du, JF (Du, Jiangfeng); Reinhard, F (Reinhard, Friedemann); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Quantum logic readout and cooling of a single dark electron spin |
| Source: PHYSICAL REVIEW B |
| Volume: 87 |
| Issue: 19 |
| Article Number: 195414 |
| DOI: 10.1103/PhysRevB.87.195414 |
| Published: MAY 9 2013 |
| Abstract: We study a single dark N2 electron spin defect in diamond, which is magnetically coupled to a nearby nitrogen-vacancy (NV) center. We perform pulsed electron spin resonance on this single spin by mapping its state to the NV center spin and optically reading out the latter. Moreover, we show that the NV center's spin polarization can be transferred to the electron spin by combined two decoupling control-NOT gates. These two results allow us to extend the NV center's two key properties-optical spin polarization and detection-to any electron spin in its vicinity. This enables dark electron spins to be used as local quantum registers and engineerable memories. |
| Accession Number: WOS:000318769400005 |
| Record 201 of 225 |
| By: Siyushev, P (Siyushev, P.); Pinto, H (Pinto, H.); Voros, M (Voeroes, M.); Gali, A (Gali, A.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.) |
| Title: Optically Controlled Switching of the Charge State of a Single Nitrogen-Vacancy Center in Diamond at Cryogenic Temperatures |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 110 |
| Issue: 16 |
| Article Number: 167402 |
| DOI: 10.1103/PhysRevLett.110.167402 |
| Published: APR 16 2013 |
| Abstract: In this Letter, the photoinduced switching of the single nitrogen-vacancy (NV) center between two different charge states, negative (NV-) and neutral (NV0), is studied under resonant excitation at liquid helium temperature. We show that resonant conversion of NV0 to NV- significantly improves spectral stability of the NV- defect and allows high fidelity initialization of the spin qubit. Based on density functional theory calculations a novel mechanism involving an Auger ionization of NV- and charge transfer of an electron from the valence band to NV0 is discussed. This study provides further insight into the charge dynamics of the NV center, which is relevant for quantum information processing based on an NV- defect in diamond. DOI: 10.1103/PhysRevLett.110.167402 |
| Accession Number: WOS:000317813600010 |
| PubMed ID: 23679637 |
| Record 202 of 225 |
| By: Niemeyer, I (Niemeyer, I.); Shim, JH (Shim, J. H.); Zhang, J (Zhang, J.); Suter, D (Suter, D.); Taniguchi, T (Taniguchi, T.); Teraji, T (Teraji, T.); Abe, H (Abe, H.); Onoda, S (Onoda, S.); Yamamoto, T (Yamamoto, T.); Ohshima, T (Ohshima, T.); Isoya, J (Isoya, J.); Jelezko, F (Jelezko, F.) |
| Title: Broadband excitation by chirped pulses: application to single electron spins in diamond |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 15 |
| Article Number: 033027 |
| DOI: 10.1088/1367-2630/15/3/033027 |
| Published: MAR 21 2013 |
| Abstract: Pulsed excitation of broad spectra requires very high field strengths if monochromatic pulses are used. If the corresponding high power is not available or not desirable, the pulses can be replaced by suitable low-power pulses that distribute the power over a wider bandwidth. As a simple case, we use microwave pulses with a linear frequency chirp. We use these pulses to excite spectra of single nitrogen-vacancy centres in a Ramsey experiment. Compared to the conventional Ramsey experiment, our approach increases the bandwidth by at least an order of magnitude. Compared to the conventional continuous wave-ODMR experiment, the chirped Ramsey experiment does not suffer from power broadening and increases the resolution by at least an order of magnitude. As an additional benefit, the chirped Ramsey spectrum contains not only 'allowed' single quantum transitions, but also 'forbidden' zero- and double quantum transitions, which can be distinguished from the single quantum transitions by phase-shifting the readout pulse with respect to the excitation pulse or by variation of the external magnetic field strength. |
| Accession Number: WOS:000316380100001 |
| Record 203 of 225 |
| By: Dolde, F (Dolde, F.); Jakobi, I (Jakobi, I.); Naydenov, B (Naydenov, B.); Zhao, N (Zhao, N.); Pezzagna, S (Pezzagna, S.); Trautmann, C (Trautmann, C.); Meijer, J (Meijer, J.); Neumann, P (Neumann, P.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.) |
| Title: Room-temperature entanglement between single defect spins in diamond |
| Source: NATURE PHYSICS |
| Volume: 9 |
| Issue: 3 |
| Pages: 139-143 |
| DOI: 10.1038/nphys2545 |
| Published: MAR 2013 |
| Abstract: Entanglement is the central yet fleeting phenomenon of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory(1), it has developed into the most central element of quantum technology. Consequently, there have been a number of experimental demonstrations of entanglement between photons(,)(2) atoms(3), ions(4) and solid-state systems such as spins or quantum dots(5-7), superconducting circuits(8,9) and macroscopic diamond(10). Here we experimentally demonstrate entanglement between two engineered single solid-state spin quantum bits (qubits) at ambient conditions. Photon emission of defect pairs reveals ground-state spin correlation. Entanglement (fidelity = 0.67 +/- 0.04) is proved by quantum state tomography. Moreover, the lifetime of electron spin entanglement is extended to milliseconds by entanglement swapping to nuclear spins. The experiments mark an important step towards a scalable room-temperature quantum device being of potential use in quantum information processing as well as metrology. |
| Accession Number: WOS:000316156300014 |
| Record 204 of 225 |
| By: Cai, JM (Cai, Jianming); Retzker, A (Retzker, Alex); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.) |
| Title: A large-scale quantum simulator on a diamond surface at room temperature |
| Source: NATURE PHYSICS |
| Volume: 9 |
| Issue: 3 |
| Pages: 168-173 |
| DOI: 10.1038/nphys2519 |
| Published: MAR 2013 |
| Abstract: Strongly correlated quantum many-body systems may exhibit exotic phases, such as spin liquids and supersolids. Although their numerical simulation becomes intractable for as few as 50 particles, quantum simulators offer a route to overcome this computational barrier. However, proposed realizations either require stringent conditions such as low temperature/ultra-high vacuum, or are extremely hard to scale. Here, we propose a new solid-state architecture for a scalable quantum simulator that consists of strongly interacting nuclear spins attached to the diamond surface. Initialization, control and read-out of this quantum simulator can be accomplished with nitrogen-vacancy centers implanted in diamond. The system can be engineered to simulate a wide variety of strongly correlated spin models. Owing to the superior coherence time of nuclear spins and nitrogen-vacancy centers in diamond, our proposal offers new opportunities towards large-scale quantum simulation at ambient conditions of temperature and pressure. |
| Accession Number: WOS:000316156300020 |
| Record 205 of 225 |
| By: Wrachtrup, J (Wrachtrup, Joerg); Jelezko, F (Jelezko, Fedor); Grotz, B (Grotz, Bernhard); McGuinness, L (McGuinness, Liam) |
| Title: Nitrogen-vacancy centers close to surfaces |
| Source: MRS BULLETIN |
| Volume: 38 |
| Issue: 2 |
| Pages: 149-154 |
| DOI: 10.1557/mrs.2013.22 |
| Published: FEB 2013 |
| Abstract: Defects in solid-state systems are responsible for much of what we take for granted in modern society, with applications ranging from electronics and lasers, to metallic alloys with tailored properties, and the unique characteristics of gemstones. As we enter the age of quantum technology, solid-state defects are also having their say, with substantial research focused on using their properties for fundamental tests of quantum mechanics, storage of quantum information, and investigations of quantum decoherence. Two of the most exciting prospects of quantum technology are the creation of computers that take advantage of quantum rather than classical laws to outperform current devices, and the realization of highly sensitive magnetometers limited only by quantum uncertainty. In pursuit of these two goals, many proposals and proof-of-principle experiments have been performed in the solid-state, which required location of defects very close to the host crystal's surface. This article reviews recent work on creation of nitrogen-vacancy centers near the diamond surface and experiments toward the realization of these goals. |
| Accession Number: WOS:000317549500012 |
| Record 206 of 225 |
| By: Aslam, N (Aslam, N.); Waldherr, G (Waldherr, G.); Neumann, P (Neumann, P.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.) |
| Title: Photo-induced ionization dynamics of the nitrogen vacancy defect in diamond investigated by single-shot charge state detection |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 15 |
| Article Number: 013064 |
| DOI: 10.1088/1367-2630/15/1/013064 |
| Published: JAN 31 2013 |
| Abstract: The nitrogen-vacancy centre (NV) has drawn much attention for over a decade, yet detailed knowledge of the photophysics needs to be established. Under typical conditions, the NV can have two stable charge states, negative (NV-) or neutral (NV0), with photo-induced interconversion of these two states. Here, we present detailed studies of the ionization dynamics of single NV centres in bulk diamond at room temperature during illumination and its dependence on the excitation wavelength and power. We apply a recent method which allows us to directly measure the charge state of a single NV centre, and observe its temporal evolution. We find that the steady-state NV- population is always <= 75% for 450-610 nm excitation wavelength. In combination with saturation measurements, we show that the optimal excitation wavelength is around 510-540 nm. Furthermore, the relative absorption cross-section of NV- is determined for 540-610 nm, revealing a double-peak structure. Finally, the energy of the NV- ground state of 2.6 eV below the conduction band is measured. These results reveal new insights into the charge state dynamics of the NV centre. |
| Accession Number: WOS:000314343500001 |
| Record 207 of 225 |
| By: Cai, JM (Cai, Jianming); Jelezko, F (Jelezko, Fedor); Plenio, MB (Plenio, Martin B.); Retzker, A (Retzker, Alex) |
| Title: Diamond-based single-molecule magnetic resonance spectroscopy |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 15 |
| Article Number: 013020 |
| DOI: 10.1088/1367-2630/15/1/013020 |
| Published: JAN 11 2013 |
| Abstract: The detection of a nuclear spin in an individual molecule represents a key challenge in physics and biology whose solution has been pursued for many years. The small magnetic moment of a single nucleus and the unavoidable environmental noise present the key obstacles for its realization. In this paper, we demonstrate theoretically that a single nitrogen-vacancy center in diamond can be used to construct a nano-scale single-molecule spectrometer that is capable of detecting the position and spin state of a single nucleus and can determine the distance and alignment of a nuclear or electron spin pair. The proposed device would find applications in single-molecule spectroscopy in chemistry and biology, for example in determining the protein structure or in monitoring macromolecular motions, and can thus provide a tool to help unravel the microscopic mechanisms underlying bio-molecular function. |
| Accession Number: WOS:000313408200004 |
| Record 208 of 225 |
| By: Nizovtsev, AP (Nizovtsev, A. P.); Kilin, SY (Kilin, S. Ya.); Pushkarchuk, AL (Pushkarchuk, A. L.); Pushkarchuk, VA (Pushkarchuk, V. A.); Jelezko, F (Jelezko, F.) |
| Edited by: Borisenko, VE (Borisenko, VE); Gaponenko, SV (Gaponenko, SV); Gurin, VS (Gurin, VS); Kam, CH (Kam, CH) |
| Title: HYPERFINE INTERACTIONS IN THE CARBON CLUSTER C291H172NV HOSTING NV CENTER |
| Source: PHYSICS, CHEMISTRY AND APPLICATIONS OF NANOSTRUCTURES: REVIEWS AND SHORT NOTES |
| Pages: 154-157 |
| Published: 2013 |
| Abstract: We present the results of quantum chemistry simulation of hyperfine interactions (hfi) between electronic spin of single NV center and arbitrary disposed C-13 nuclear spins in the NV-hosting H-terminated cluster C291NVH172. The calculated hfi matrices are used in spin-Hamiltonians to simulate available experimental observations. |
| Conference Title: International Conference on Physics, Chemistry and Applications of Nanostructures (NANOMEETING) |
| Conference Date: MAY 28-31, 2013 |
| Conference Location: Minsk, BYELARUS |
| Sponsor(s): Belarusian State Univ Informat & Radioelectron, Minist Educ Belarus; Aix Marseille Univ; Nanyang Technol Univ; EU FP7 Project BELERA; Ctr Natl Rech Sci; Belarusian Republican Fdn Fundamental Res; Faldes; Zelnas; Profess Radio Syst |
| Accession Number: WOS:000337564500038 |
| Record 209 of 225 |
| By: Jelezko, F (Jelezko, Fedor) |
| Edited by: Prati, E (Prati, E); Shinada, T (Shinada, T) |
| Title: Single Spins in Diamond: Novel Quantum Devices and Atomic Sensors |
| Source: SINGLE-ATOM NANOELECTRONICS |
| Pages: 281-304 |
| Published: 2013 |
| Accession Number: WOS:000328280800013 |
| Record 210 of 225 |
| By: Beha, K (Beha, Katja); Fedder, H (Fedder, Helmut); Wolfer, M (Wolfer, Marco); Becker, MC (Becker, Merle C.); Siyushev, P (Siyushev, Petr); Jamali, M (Jamali, Mohammad); Batalov, A (Batalov, Anton); Hinz, C (Hinz, Christopher); Hees, J (Hees, Jakob); Kirste, L (Kirste, Lutz); Obloh, H (Obloh, Harald); Gheeraert, E (Gheeraert, Etienne); Naydenov, B (Naydenov, Boris); Jakobi, I (Jakobi, Ingmar); Dolde, F (Dolde, Florian); Pezzagna, S (Pezzagna, Sebastien); Twittchen, D (Twittchen, Daniel); Markham, M (Markham, Matthew); Dregely, D (Dregely, Daniel); Giessen, H (Giessen, Harald); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Nebel, CE (Nebel, Christoph E.); Bratschitsch, R (Bratschitsch, Rudolf); Leitenstorfer, A (Leitenstorfer, Alfred); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Diamond nanophotonics |
| Source: BEILSTEIN JOURNAL OF NANOTECHNOLOGY |
| Volume: 3 |
| Pages: 895-908 |
| DOI: 10.3762/bjnano.3.100 |
| Published: DEC 21 2012 |
| Abstract: We demonstrate the coupling of single color centers in diamond to plasmonic and dielectric photonic structures to realize novel nanophotonic devices. Nanometer spatial control in the creation of single color centers in diamond is achieved by implantation of nitrogen atoms through high-aspect-ratio channels in a mica mask. Enhanced broadband single-photon emission is demonstrated by coupling nitrogen-vacancy centers to plasmonic resonators, such as metallic nanoantennas. Improved photon-collection efficiency and directed emission is demonstrated by solid immersion lenses and micropillar cavities. Thereafter, the coupling of diamond nanocrystals to the guided modes of micropillar resonators is discussed along with experimental results. Finally, we present a gas-phase-doping approach to incorporate color centers based on nickel and tungsten, in situ into diamond using microwave-plasma-enhanced chemical vapor deposition. The fabrication of silicon-vacancy centers in nanodiamonds by microwave-plasma-enhanced chemical vapor deposition is discussed in addition. |
| Accession Number: WOS:000312886900001 |
| PubMed ID: 23365803 |
| Record 211 of 225 |
| By: Cai, JM (Cai, J-M); Naydenov, B (Naydenov, B.); Pfeiffer, R (Pfeiffer, R.); McGuinness, LP (McGuinness, L. P.); Jahnke, KD (Jahnke, K. D.); Jelezko, F (Jelezko, F.); Plenio, MB (Plenio, M. B.); Retzker, A (Retzker, A.) |
| Title: Robust dynamical decoupling with concatenated continuous driving |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 14 |
| Article Number: 113023 |
| DOI: 10.1088/1367-2630/14/11/113023 |
| Published: NOV 20 2012 |
| Abstract: The loss of coherence is one of the main obstacles for the implementation of quantum information processing. The efficiency of dynamical decoupling schemes, which have been introduced to address this problem, is limited itself by the fluctuations in the driving fields which will themselves introduce noise. We address this challenge by introducing the concept of concatenated continuous dynamical decoupling, which can overcome not only external magnetic noise but also noise due to fluctuations in driving fields. We show theoretically that this approach can achieve relaxation limited coherence times, and demonstrate experimentally that already the most basic implementation of this concept yields an order of magnitude improvement to the decoherence time for the electron spin of nitrogen vacancy centers in diamond. The proposed scheme can be applied to a wide variety of other physical systems, including trapped atoms and ions and quantum dots, and may be combined with other quantum technologies challenges such as quantum sensing and quantum information processing. |
| Accession Number: WOS:000311579900002 |
| Record 212 of 225 |
| By: Waldherr, G (Waldherr, Gerald); Dada, AC (Dada, Adetunmise C.); Neumann, P (Neumann, Philipp); Jelezko, F (Jelezko, Fedor); Andersson, E (Andersson, Erika); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Distinguishing between Nonorthogonal Quantum States of a Single Nuclear Spin |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 109 |
| Issue: 18 |
| Article Number: 180501 |
| DOI: 10.1103/PhysRevLett.109.180501 |
| Published: NOV 2 2012 |
| Abstract: An important task for quantum-information processing is optimal discrimination between two nonorthogonal quantum states, which until now has been realized only optically. Here, we present and compare experimental realizations of optimal quantum measurements for distinguishing between two nonorthogonal quantum states encoded in a single N-14 nuclear spin at a nitrogen-vacancy defect in diamond. Implemented measurement schemes are the minimum-error measurement (known as Helstrom measurement), unambiguous state discrimination using a standard projective measurement, and optimal unambiguous state discrimination [known as Ivanovic-Dieks-Peres (IDP) measurement], which utilizes a three-dimensional Hilbert space. This allows us to benchmark the IDP measurement against the standard projective measurements. Measurement efficiencies are found to be above 80% for all schemes and reach a value of 90% for the IDP measurement. |
| Accession Number: WOS:000310612000002 |
| PubMed ID: 23215260 |
| Record 213 of 225 |
| By: Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Focus on diamond-based photonics and spintronics |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 14 |
| Article Number: 105024 |
| DOI: 10.1088/1367-2630/14/10/105024 |
| Published: OCT 25 2012 |
| Abstract: The ability to control the state of individual atoms is a new challenge for science and technology in the 21st century. Currently, experiments on individual quantum systems such as trapped ions, single molecules, quantum dots, superconducting qubits and photons are crucial for the rapidly growing field of quantum information processing and communication. In general, solid state systems are preferable for scaling and the choice of material plays a crucial role; for example, in classical electronic devices continual performance enhancement and miniaturization is strongly linked to the success of silicon-based technology. For quantum applications, diamond has the potential to become the material of choice, because its large bandgap enables the control of optically active impurities and higher operation temperature. This focus issue collates original research contributions from some of the leading groups in the field as a showcase for the very latest developments in diamond-based quantum technologies. |
| Accession Number: WOS:000310441200001 |
| Record 214 of 225 |
| By: Zhao, N (Zhao, Nan); Honert, J (Honert, Jan); Schmid, B (Schmid, Bernhard); Klas, M (Klas, Michael); Isoya, J (Isoya, Junichi); Markham, M (Markham, Matthew); Twitchen, D (Twitchen, Daniel); Jelezko, F (Jelezko, Fedor); Liu, RB (Liu, Ren-Bao); Fedder, H (Fedder, Helmut); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Sensing single remote nuclear spins |
| Source: NATURE NANOTECHNOLOGY |
| Volume: 7 |
| Issue: 10 |
| Pages: 657-662 |
| DOI: 10.1038/NNANO.2012.152 |
| Published: OCT 2012 |
| Abstract: The detection of single nuclear spins would be useful for fields ranging from basic science to quantum information technology. However, although sensing based on diamond defects(1,2) and other methods(3) have shown high sensitivity(1-3), they have not been capable of detecting single nuclear spins, and defect-based techniques further require strong defect-spin coupling(4,5). Here, we present the detection and identification of single and remote C-13 nuclear spins embedded in nuclear spin baths surrounding a single electron spin of a nitrogen-vacancy centre in diamond. We are able to amplify and detect the weak magnetic field noise (similar to 10 nT) from a single nuclear spin located similar to 3 nm from the centre using dynamical decoupling control(6-10), and achieve a detectable hyperfine coupling strength as weak as similar to 300 Hz. We also confirm the quantum nature of the coupling, and measure the spin-defect distance and the vector components of the nuclear field. The technique marks a step towards imaging, detecting and controlling nuclear spins in single molecules. |
| Accession Number: WOS:000309675000016 |
| PubMed ID: 22941402 |
| Record 215 of 225 |
| By: Taminiau, TH (Taminiau, T. H.); Wagenaar, JJT (Wagenaar, J. J. T.); Van der Sar, T (Van der Sar, T.); Jelezko, F (Jelezko, F.); Dobrovitski, VV (Dobrovitski, V. V.); Hanson, R (Hanson, R.) |
| Title: Detection and Control of Individual Nuclear Spins Using a Weakly Coupled Electron Spin |
| Source: PHYSICAL REVIEW LETTERS |
| Volume: 109 |
| Issue: 13 |
| Article Number: 137602 |
| DOI: 10.1103/PhysRevLett.109.137602 |
| Published: SEP 25 2012 |
| Abstract: We experimentally isolate, characterize, and coherently control up to six individual nuclear spins that are weakly coupled to an electron spin in diamond. Our method employs multipulse sequences on the electron spin that resonantly amplify the interaction with a selected nuclear spin and at the same time dynamically suppress decoherence caused by the rest of the spin bath. We are able to address nuclear spins with interaction strengths that are an order of magnitude smaller than the electron spin dephasing rate. Our results provide a route towards tomography with single-nuclear-spin sensitivity and greatly extend the number of available quantum bits for quantum information processing in diamond. |
| Accession Number: WOS:000309206700009 |
| PubMed ID: 23030119 |
| Record 216 of 225 |
| By: Cai, JM (Cai, Jianming); Jelezko, F (Jelezko, Fedor); Katz, N (Katz, Nadav); Retzker, A (Retzker, Alex); Plenio, MB (Plenio, Martin B.) |
| Title: Long-lived driven solid-state quantum memory |
| Source: NEW JOURNAL OF PHYSICS |
| Volume: 14 |
| Article Number: 093030 |
| DOI: 10.1088/1367-2630/14/9/093030 |
| Published: SEP 17 2012 |
| Abstract: We investigate the performance of inhomogeneously broadened spin ensembles as quantum memories under continuous dynamical decoupling. The role of the continuous driving field is twofold: firstly, it decouples individual spins from magnetic noise; secondly, and more importantly, it suppresses and reshapes the spectral inhomogeneity of spin ensembles. We show that a continuous driving field, which itself may also be inhomogeneous over the ensemble, can considerably enhance the decay of the tails of the inhomogeneous broadening distribution. This fact enables a spin-ensemble-based quantum memory to exploit the effect of cavity protection and achieve a much longer storage time. In particular, for a spin ensemble with a Lorentzian spectral distribution, our calculations demonstrate that continuous dynamical decoupling has the potential to improve its storage time by orders of magnitude for the state-of-the-art experimental parameters. |
| Accession Number: WOS:000308804300003 |
| Record 217 of 225 |
| By: Jahnke, KD (Jahnke, K. D.); Naydenov, B (Naydenov, B.); Teraji, T (Teraji, T.); Koizumi, S (Koizumi, S.); Umeda, T (Umeda, T.); Isoya, J (Isoya, J.); Jelezko, F (Jelezko, F.) |
| Title: Long coherence time of spin qubits in C-12 enriched polycrystalline chemical vapor deposition diamond |
| Source: APPLIED PHYSICS LETTERS |
| Volume: 101 |
| Issue: 1 |
| Article Number: 012405 |
| DOI: 10.1063/1.4731778 |
| Published: JUL 2 2012 |
| Abstract: Single defects in diamond and especially negatively charged nitrogen vacancy (NV) centers are very promising quantum systems with wide applications in physics and biology. It was shown that their coherence properties can be strongly improved by growing ultrapure diamond with low concentration of parasitic spins associated with nitrogen electron spins and nuclear spins related to C-13 carbon isotope. Here we report a high quality C-12-enriched polycrystalline chemical vapor deposition diamond material with properties comparable with single crystals. We find single NVs in the grains of this material, which show extremely long electron spin coherence time T-2 > 2 ms. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4731778] |
| Accession Number: WOS:000306144800039 |
| Record 218 of 225 |
| By: Hall, LT (Hall, L. T.); Beart, GCG (Beart, G. C. G.); Thomas, EA (Thomas, E. A.); Simpson, DA (Simpson, D. A.); McGuinness, LP (McGuinness, L. P.); Cole, JH (Cole, J. H.); Manton, JH (Manton, J. H.); Scholten, RE (Scholten, R. E.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, Joerg); Petrou, S (Petrou, S.); Hollenberg, LCL (Hollenberg, L. C. L.) |
| Title: High spatial and temporal resolution wide-field imaging of neuron activity using quantum NV-diamond |
| Source: SCIENTIFIC REPORTS |
| Volume: 2 |
| Article Number: 401 |
| DOI: 10.1038/srep00401 |
| Published: MAY 9 2012 |
| Abstract: A quantitative understanding of the dynamics of biological neural networks is fundamental to gaining insight into information processing in the brain. While techniques exist to measure spatial or temporal properties of these networks, it remains a significant challenge to resolve the neural dynamics with subcellular spatial resolution. In this work we consider a fundamentally new form of wide-field imaging for neuronal networks based on the nanoscale magnetic field sensing properties of optically active spins in a diamond substrate. We analyse the sensitivity of the system to the magnetic field generated by an axon transmembrane potential and confirm these predictions experimentally using electronically-generated neuron signals. By numerical simulation of the time dependent transmembrane potential of a morphologically reconstructed hippocampal CA1 pyramidal neuron, we show that the imaging system is capable of imaging planar neuron activity non-invasively at millisecond temporal resolution and micron spatial resolution over wide-fields. |
| Accession Number: WOS:000303806400001 |
| PubMed ID: 22574249 |
| Record 219 of 225 |
| By: Doherty, MW (Doherty, M. W.); Dolde, F (Dolde, F.); Fedder, H (Fedder, H.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.); Manson, NB (Manson, N. B.); Hollenberg, LCL (Hollenberg, L. C. L.) |
| Title: Theory of the ground-state spin of the NV- center in diamond |
| Source: PHYSICAL REVIEW B |
| Volume: 85 |
| Issue: 20 |
| Article Number: 205203 |
| DOI: 10.1103/PhysRevB.85.205203 |
| Published: MAY 3 2012 |
| Abstract: The ground-state spin of the negatively charged nitrogen-vacancy center in diamond has been the platform for the recent rapid expansion of new frontiers in quantum metrology and solid-state quantum-information processing. However, in spite of its many outstanding demonstrations, the theory of the spin has not yet been fully developed, and there do not currently exist thorough explanations for many of its properties, such as the anisotropy of the electron g factor and the existence of Stark effects and strain splittings. In this work, the theory of the ground-state spin is fully developed using the molecular orbital theory of the center in order to provide detailed explanations for the spin's fine and hyperfine structures and its interactions with electric, magnetic, and strain fields. Given these explanations, a general solution is obtained for the spin in any given electric-magnetic-strain field configuration, and the effects of the fields on the spin's coherent evolution, relaxation, and inhomogeneous dephasing are examined. Thus, this work provides the essential theoretical tools for the precise control and modeling of this remarkable spin in its current and future applications. |
| Accession Number: WOS:000303655500006 |
| Record 220 of 225 |
| By: Mizuochi, N (Mizuochi, N.); Makino, T (Makino, T.); Kato, H (Kato, H.); Takeuchi, D (Takeuchi, D.); Ogura, M (Ogura, M.); Okushi, H (Okushi, H.); Nothaft, M (Nothaft, M.); Neumann, P (Neumann, P.); Gali, A (Gali, A.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.); Yamasaki, S (Yamasaki, S.) |
| Title: Electrically driven single-photon source at room temperature in diamond |
| Source: NATURE PHOTONICS |
| Volume: 6 |
| Issue: 5 |
| Pages: 299-303 |
| DOI: 10.1038/NPHOTON.2012.75 |
| Published: MAY 2012 |
| Abstract: Single-photon sources that provide non-classical light states on demand have a broad range of applications in quantum communication, quantum computing and metrology(1). Single-photon emission has been demonstrated using single atoms(2), ions(3), molecules(4), diamond colour centres(5,6) and semiconductor quantum dots(7-11). Significant progress in highly efficient(8,11) and entangled photons(9) sources has recently been shown in semiconductor quantum dots; however, the requirement of cryogenic temperatures due to the necessity to confine carriers is a major obstacle. Here, we show the realization of a stable, room-temperature, electrically driven single-photon source based on a single neutral nitrogen-vacancy centre in a novel diamond diode structure. Remarkably, the generation of electroluminescence follows kinetics fundamentally different from that of photoluminescence with intra-bandgap excitation. This suggests electroluminescence is generated by electron-hole recombination at the defect. Our results prove that functional single defects can be integrated into electronic control structures, which is a crucial step towards elaborate quantum information devices. |
| Accession Number: WOS:000303547000013 |
| Record 221 of 225 |
| By: Nothaft, M (Nothaft, Maximilian); Hohla, S (Hoehla, Steffen); Jelezko, F (Jelezko, Fedor); Pflaum, J (Pflaum, Jens); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Single molecule electrical excitation |
| Source: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS |
| Volume: 249 |
| Issue: 4 |
| Pages: 653-660 |
| DOI: 10.1002/pssb.201100778 |
| Published: APR 2012 |
| Abstract: Optical studies of individual molecules offer the unique possibility of investigating the local environment of single quantum objects on nanometre length scales and of employing molecular systems as non-classical light sources at room temperature. Usually, single molecule excitation is based on optical stimulation by laser radiation. In this feature article, we present an alternative approach by utilizing charge injection in combination with molecular electronhole recombination to electrically excite single fluorescent dyes. The successful implementation of this strategy promotes the realization of electrically driven single photon sources on demand operating at room temperature and being feasible on a vast number of molecules emitting at e.g. telecommunication wavelengths. Moreover, these probes render probing the charge carrier transport and recombination on molecular length scales. In this article, we will first discuss the interaction of single charge carriers with optically excited molecules characterized by a decrease of photoluminescence intensity with increasing current density. As it is demonstrated, this effect originates from strong electrical pumping of triplet state populations upon charge carrier recombination. Secondly, the prospect of using phosphorescent emitters as electrically driven single photon sources at room temperature will be discussed. Finally, we will highlight that photoluminescence quenching of single fluorescent dyes provides a sensitive tool to quantify local current densities and recombination dynamics in operational organic light emitting diode devices with molecular spatial resolution. |
| Accession Number: WOS:000302003600003 |
| Record 222 of 225 |
| By: Nothaft, M (Nothaft, Maximilian); Hohla, S (Hoehla, Steffen); Jelezko, F (Jelezko, Fedor); Pflaum, J (Pflaum, Jens); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: The role of oxygen-induced processes on the emission characteristics of single molecule emitters |
| Source: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS |
| Volume: 249 |
| Issue: 4 |
| Pages: 661-665 |
| DOI: 10.1002/pssb.201100794 |
| Published: APR 2012 |
| Abstract: Single molecule studies are limited to a defined class of organic dye molecules inserted into respective host materials. Basic requirements for suited material combinations include high photon emission rates and long term photostability. A majority of known aromatic hostguest systems employ crystalline organic matrices to prevent dye molecules from uncontrolled reactions with contaminants. However, in terms of device fabrication and technological potentials it is often desirable to use polymers as room temperature host matrices. Unfortunately, single dye molecule investigations in polymers at room temperature usually report orders of magnitude lower photostabilities compared to their crystalline molecular counterparts, leading to a reduced interest in organic thin film applications. In this report, we exemplary demonstrate the feasibility of engineering a hostguest system based on dibenzoterrylene dye molecules which were diluted into the polymer poly-(p-phenylene-vinylene) (PPV) possessing very low photobleaching probabilities at room temperature. By controlling the oxygen exposure during manufacturing the number of emitted photons prior to photobleaching was significantly increased from 106 up to 1011 photons. Employing suited encapsulation techniques to prevent oxygen penetration after hostguest preparation, photostable devices over prolonged time periods on the order of months to years could be achieved. Therefore, this approach grants access to a variety of new polymer based combinations of hostguest systems for studying single molecular quantum emitters inside organic electronic devices and nanostructured polymer films with sufficient count rates and long-term stability at room temperature. |
| Accession Number: WOS:000302003600004 |
| Record 223 of 225 |
| By: Grotz, B (Grotz, Bernhard); Hauf, MV (Hauf, Moritz V.); Dankerl, M (Dankerl, Markus); Naydenov, B (Naydenov, Boris); Pezzagna, S (Pezzagna, Sebastien); Meijer, J (Meijer, Jan); Jelezko, F (Jelezko, Fedor); Wrachtrup, J (Wrachtrup, Joerg); Stutzmann, M (Stutzmann, Martin); Reinhard, F (Reinhard, Friedemann); Garrido, JA (Garrido, Jose A.) |
| Title: Charge state manipulation of qubits in diamond |
| Source: NATURE COMMUNICATIONS |
| Volume: 3 |
| Article Number: 729 |
| DOI: 10.1038/ncomms1729 |
| Published: MAR 2012 |
| Abstract: The nitrogen-vacancy (NV) centre in diamond is a promising candidate for a solid-state qubit. However, its charge state is known to be unstable, discharging from the qubit state NV- into the neutral state NV0 under various circumstances. Here we demonstrate that the charge state can be controlled by an electrolytic gate electrode. This way, single centres can be switched from an unknown non-fluorescent state into the neutral charge state NV0, and the population of an ensemble of centres can be shifted from NV0 to NV-. Numerical simulations confirm the manipulation of the charge state to be induced by the gate-controlled shift of the Fermi level at the diamond surface. This result opens the way to a dynamic control of transitions between charge states and to explore hitherto inaccessible states, such as NV+. |
| Accession Number: WOS:000302630100018 |
| PubMed ID: 22395620 |
| Record 224 of 225 |
| By: Waldherr, G (Waldherr, G.); Beck, J (Beck, J.); Neumann, P (Neumann, P.); Said, RS (Said, R. S.); Nitsche, M (Nitsche, M.); Markham, ML (Markham, M. L.); Twitchen, DJ (Twitchen, D. J.); Twamley, J (Twamley, J.); Jelezko, F (Jelezko, F.); Wrachtrup, J (Wrachtrup, J.) |
| Title: High-dynamic-range magnetometry with a single nuclear spin in diamond |
| Source: NATURE NANOTECHNOLOGY |
| Volume: 7 |
| Issue: 2 |
| Pages: 105-108 |
| DOI: 10.1038/NNANO.2011.224 |
| Published: FEB 2012 |
| Abstract: Sensors based on the nitrogen-vacancy defect in diamond are being developed to measure weak magnetic and electric fields at the nanoscale(1-5). However, such sensors rely on measurements of a shift in the Lamor frequency of the defect, so an accumulation of quantum phase causes the measurement signal to exhibit a periodic modulation. This means that the measurement time is either restricted to half of one oscillation period, which limits accuracy, or that the magnetic field range must be known in advance. Moreover, the precision increases only slowly (as T-0.5) with measurement time T (ref. 3). Here, we implement a quantum phase estimation algorithm(6-8) on a single nuclear spin in diamond to combine both high sensitivity and high dynamic range. By achieving a scaling of the precision with time to T-0.85, we improve the sensitivity by a factor of 7.4 for an accessible field range of 16 mT, or, alternatively, we improve the dynamic range by a factor of 130 for a sensitivity of 2.5 mu T Hz(-1/2). Quantum phase estimation algorithms have also recently been implemented using a single electron spin in a nitrogen-vacancy centre(9). These methods are applicable to a variety of field detection schemes, and do not require quantum entanglement. |
| Accession Number: WOS:000300398900011 |
| PubMed ID: 22179568 |
| Record 225 of 225 |
| By: Nothaft, M (Nothaft, Maximilian); Hohla, S (Hoehla, Steffen); Jelezko, F (Jelezko, Fedor); Fruhauf, N (Fruehauf, Norbert); Pflaum, J (Pflaum, Jens); Wrachtrup, J (Wrachtrup, Joerg) |
| Title: Electrically driven photon antibunching from a single molecule at room temperature |
| Source: NATURE COMMUNICATIONS |
| Volume: 3 |
| Article Number: 628 |
| DOI: 10.1038/ncomms1637 |
| Published: JAN 2012 |
| Abstract: Single-photon emitters have been considered for applications in quantum information processing, quantum cryptography and metrology. For the sake of integration and to provide an electron photon interface, it is of great interest to stimulate single-photon emission by electrical excitation as demonstrated for quantum dots. Because of low exciton binding energies, it has so far not been possible to detect sub-Poissonian photon statistics of electrically driven quantum dots at room temperature. However, organic molecules possess exciton binding energies on the order of 1 eV, thereby facilitating the development of an electrically driven single-photon source at room temperature in a solid-state matrix. Here we demonstrate electroluminescence of single, electrically driven molecules at room temperature. By careful choice of the molecular emitter, as well as fabrication of a specially designed organic light-emitting diode structure, we were able to achieve stable single-molecule emission and detect sub-Poissonian photon statistics. |
| Accession Number: WOS:000299921000026 |
| PubMed ID: 22252552 |