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      Decoherence of V $$ {}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ spin defects in monoisotopic hexagonal boron nitride

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          Abstract

          Spin defects in hexagonal boron nitride (hBN) are promising quantum systems for the design of flexible two-dimensional quantum sensing platforms. Here we rely on hBN crystals isotopically enriched with either 10B or 11B to investigate the isotope-dependent properties of a spin defect featuring a broadband photoluminescence signal in the near infrared. By analyzing the hyperfine structure of the spin defect while changing the boron isotope, we first confirm that it corresponds to the negatively charged boron-vacancy center ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$\end{document} ). We then show that its spin coherence properties are slightly improved in 10B-enriched samples. This is supported by numerical simulations employing cluster correlation expansion methods, which reveal the importance of the hyperfine Fermi contact term for calculating the coherence time of point defects in hBN. Using cross-relaxation spectroscopy, we finally identify dark electron spin impurities as an additional source of decoherence. This work provides new insights into the properties of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$\end{document} spin defects, which are valuable for the future development of hBN-based quantum sensing foils.

          Abstract

          Recently, coherent control of spin defects in hBN has been realized, enabling future applications in quantum sensing technologies. Here the authors perform a systematic study of isotope-dependent spin coherence properties of the negatively-charged boron-vacancy defect in monoisotopic hBN crystals.

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          First-principles calculations for point defects in solids

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            Nitrogen-vacancy centers in diamond: nanoscale sensors for physics and biology.

            Crystal defects in diamond have emerged as unique objects for a variety of applications, both because they are very stable and because they have interesting optical properties. Embedded in nanocrystals, they can serve, for example, as robust single-photon sources or as fluorescent biomarkers of unlimited photostability and low cytotoxicity. The most fascinating aspect, however, is the ability of some crystal defects, most prominently the nitrogen-vacancy (NV) center, to locally detect and measure a number of physical quantities, such as magnetic and electric fields. This metrology capacity is based on the quantum mechanical interactions of the defect's spin state. In this review, we introduce the new and rapidly evolving field of nanoscale sensing based on single NV centers in diamond. We give a concise overview of the basic properties of diamond, from synthesis to electronic and magnetic properties of embedded NV centers. We describe in detail how single NV centers can be harnessed for nanoscale sensing, including the physical quantities that may be detected, expected sensitivities, and the most common measurement protocols. We conclude by highlighting a number of the diverse and exciting applications that may be enabled by these novel sensors, ranging from measurements of ion concentrations and membrane potentials to nanoscale thermometry and single-spin nuclear magnetic resonance.
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              Quantum emission from hexagonal boron nitride monolayers

              Artificial atomic systems in solids are widely considered the leading physical system for a variety of quantum technologies, including quantum communications, computing and metrology. To date, however, room-temperature quantum emitters have only been observed in wide-bandgap semiconductors such as diamond and silicon carbide, nanocrystal quantum dots, and most recently in carbon nanotubes. Single-photon emission from two-dimensional materials has been reported, but only at cryogenic temperatures. Here, we demonstrate room-temperature, polarized and ultrabright single-photon emission from a colour centre in two-dimensional hexagonal boron nitride. Density functional theory calculations indicate that vacancy-related defects are a probable source of the emission. Our results demonstrate the unprecedented potential of van der Waals crystals for large-scale nanophotonics and quantum information processing.
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                Author and article information

                Contributors
                vincent.jacques@umontpellier.fr
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                27 July 2022
                27 July 2022
                2022
                : 13
                : 4347
                Affiliations
                [1 ]GRID grid.121334.6, ISNI 0000 0001 2097 0141, Laboratoire Charles Coulomb, , Université de Montpellier and CNRS, ; Montpellier, France
                [2 ]GRID grid.36567.31, ISNI 0000 0001 0737 1259, Tim Taylor Department of Chemical Engineering, , Kansas State University, ; Manhattan, KS USA
                [3 ]GRID grid.419560.f, ISNI 0000 0001 2154 3117, Max Planck Institute for the Physics of Complex Systems, ; Dresden, Germany
                [4 ]GRID grid.5640.7, ISNI 0000 0001 2162 9922, Department of Physics, , Linköping University, ; Linköping, Sweden
                [5 ]GRID grid.419766.b, ISNI 0000 0004 1759 8344, Wigner Research Centre for Physics, ; Budapest, Hungary
                [6 ]GRID grid.6759.d, ISNI 0000 0001 2180 0451, Department of Atomic Physics, , Budapest University of Technology and Economics, ; Budapest, Hungary
                Author information
                http://orcid.org/0000-0001-8761-3712
                http://orcid.org/0000-0003-4278-4141
                http://orcid.org/0000-0002-5118-0908
                http://orcid.org/0000-0003-0918-5964
                http://orcid.org/0000-0002-3339-5470
                http://orcid.org/0000-0002-1588-887X
                http://orcid.org/0000-0001-5471-6061
                Article
                31743
                10.1038/s41467-022-31743-0
                9329290
                35896526
                55f633fd-a733-4ed5-b7f0-5f8843dbfb2a
                © The Author(s) 2022

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 24 January 2022
                : 21 June 2022
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100001665, Agence Nationale de la Recherche (French National Research Agency);
                Award ID: ANR-21-ESRE-0025
                Award Recipient :
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                Custom metadata
                © The Author(s) 2022

                Uncategorized
                quantum metrology,two-dimensional materials,qubits
                Uncategorized
                quantum metrology, two-dimensional materials, qubits

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