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Giri R, Jensen RH, Khurana D, Bocquel J, Radko IP, Lang J, Osterkamp C, Jelezko F, Berg-So̷rensen K, Andersen UL, Huck A. Charge Stability and Charge-State-Based Spin Readout of Shallow Nitrogen-Vacancy Centers in Diamond. ACS APPLIED ELECTRONIC MATERIALS 2023; 5:6603-6610. [PMID: 38162528 PMCID: PMC10753810 DOI: 10.1021/acsaelm.3c01141] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/10/2023] [Accepted: 11/12/2023] [Indexed: 01/03/2024]
Abstract
Spin-based applications of the negatively charged nitrogen-vacancy (NV) center in diamonds require an efficient spin readout. One approach is the spin-to-charge conversion (SCC), relying on mapping the spin states onto the neutral (NV0) and negative (NV-) charge states followed by a subsequent charge readout. With high charge-state stability, SCC enables extended measurement times, increasing precision and minimizing noise in the readout compared to the commonly used fluorescence detection. Nanoscale sensing applications, however, require shallow NV centers within a few nanometers distance from the surface where surface related effects might degrade the NV charge state. In this article, we investigate the charge state initialization and stability of single NV centers implanted ≈5 nm below the surface of a flat diamond plate. We demonstrate the SCC protocol on four shallow NV centers suitable for nanoscale sensing, obtaining a reduced readout noise of 5-6 times the spin-projection noise limit. We investigate the general applicability of the SCC for shallow NV centers and observe a correlation between the NV charge-state stability and readout noise. Coating the diamond with glycerol improves both the charge initialization and stability. Our results reveal the influence of the surface-related charge environment on the NV charge properties and motivate further investigations to functionalize the diamond surface with glycerol or other materials for charge-state stabilization and efficient spin-state readout of shallow NV centers suitable for nanoscale sensing.
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Affiliation(s)
- Rakshyakar Giri
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Rasmus Ho̷y Jensen
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Deepak Khurana
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Juanita Bocquel
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Ilya P. Radko
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Johannes Lang
- Institute
for Quantum Optics and Center for Integrated Quantum Science and Technology
(IQST), Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Christian Osterkamp
- Institute
for Quantum Optics and Center for Integrated Quantum Science and Technology
(IQST), Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Fedor Jelezko
- Institute
for Quantum Optics and Center for Integrated Quantum Science and Technology
(IQST), Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | | | - Ulrik L. Andersen
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Alexander Huck
- Center
for Macroscopic Quantum States (bigQ), Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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2
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Staudenmaier N, Vijayakumar-Sreeja A, Genov G, Cohen D, Findler C, Lang J, Retzker A, Jelezko F, Oviedo-Casado S. Optimal Sensing Protocol for Statistically Polarized Nano-NMR with NV Centers. PHYSICAL REVIEW LETTERS 2023; 131:150801. [PMID: 37897751 DOI: 10.1103/physrevlett.131.150801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 08/29/2023] [Indexed: 10/30/2023]
Abstract
Diffusion noise represents a major constraint to successful liquid state nano-NMR spectroscopy. Using the Fisher information as a faithful measure, we theoretically calculate and experimentally show that phase sensitive protocols are superior in most experimental scenarios, as they maximize information extraction from correlations in the sample. We derive the optimal experimental parameters for quantum heterodyne detection (Qdyne) and present the most accurate statistically polarized nano-NMR Qdyne detection experiments to date, leading the way to resolve chemical shifts and J couplings at the nanoscale.
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Affiliation(s)
- Nicolas Staudenmaier
- Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | | | - Genko Genov
- Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Daniel Cohen
- Racah Institute of Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Christoph Findler
- Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- Diatope GmbH, Buchenweg 23, 88444 Ummendorf, Germany
| | - Johannes Lang
- Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- Diatope GmbH, Buchenweg 23, 88444 Ummendorf, Germany
| | - Alex Retzker
- Racah Institute of Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
- AWS Center for Quantum Computing, Pasadena 91125, California, USA
| | - Fedor Jelezko
- Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Santiago Oviedo-Casado
- Racah Institute of Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
- Área de Física Aplicada, Universidad Politécnica de Cartagena, Cartagena E-30202, Spain
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Abendroth JM, Herb K, Janitz E, Zhu T, Völker LA, Degen CL. Single-Nitrogen-Vacancy NMR of Amine-Functionalized Diamond Surfaces. NANO LETTERS 2022; 22:7294-7303. [PMID: 36069765 DOI: 10.1021/acs.nanolett.2c00533] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nuclear magnetic resonance (NMR) imaging with shallow nitrogen-vacancy (NV) centers in diamond offers an exciting route toward sensitive and localized chemical characterization at the nanoscale. Remarkable progress has been made to combat the degradation in coherence time and stability suffered by near-surface NV centers using suitable chemical surface termination. However, approaches that also enable robust control over adsorbed molecule density, orientation, and binding configuration are needed. We demonstrate a diamond surface preparation for mixed nitrogen- and oxygen-termination that simultaneously improves NV center coherence times for <10 nm-deep emitters and enables direct and recyclable chemical functionalization via amine-reactive cross-linking. Using this approach, we probe single NV centers embedded in nanopillar waveguides to perform 19F NMR sensing of covalently bound fluorinated molecules with detection on the order of 100 molecules. This work signifies an important step toward nuclear spin localization and structure interrogation at the single-molecule level.
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Affiliation(s)
- John M Abendroth
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
| | - Konstantin Herb
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
| | - Erika Janitz
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
| | - Tianqi Zhu
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
| | - Laura A Völker
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
| | - Christian L Degen
- Department of Physics, ETH Zurich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland
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