Single-Shot Readout and Weak Measurement of a Tin-Vacancy Qubit in Diamond

Journal Article · 08 October 2024 · Physical Review. X

DOI: https://doi.org/10.1103/PhysRevX.14.041008 · OSTI ID:2459370

Rosenthal, Eric I. ; Biswas, Souvik ; Scuri, Giovanni ; Lee, Hope ; Stein, Abigail J. ; Kleidermacher, Hannah C. ; Grzesik, Jakob ; Rugar, Alison E. ; Aghaeimeibodi, Shahriar ; Riedel, Daniel ; Titze, Michael ; Bielejec, Edward S. ; Choi, Joonhee ; Anderson, Christopher P. ; Vučković, Jelena

The negatively charged tin-vacancy center in diamond ( ${\mathrm{SnV}}^{-}$ ) is an emerging platform for building the next generation of long-distance quantum networks. This is due to the ${\mathrm{SnV}}^{-}$ ’s favorable optical and spin properties including bright emission, insensitivity to electronic noise, and long spin coherence times at temperatures above 1 K. Here, we demonstrate measurement of a single ${\mathrm{SnV}}^{-}$ electronic spin with a single-shot readout fidelity of 87.4%, which can be further improved to 98.5% by conditioning on multiple readouts. In the process, we develop understanding of the relationship between strain, magnetic field, spin readout, and microwave spin control. We show that high-fidelity readout is compatible with rapid microwave spin control, demonstrating a favorable parameter regime for use of the ${\mathrm{SnV}}^{-}$ center as a high-quality spin-photon interface. Finally, we use weak quantum measurement to study measurement-induced dephasing; this illuminates the fundamental interplay between measurement and decoherence in quantum mechanics, and provides a universal method to characterize the efficiency of color-center spin readout. Taken together, these results overcome an important hurdle in the development of the ${\mathrm{SnV}}^{-}$ -based quantum technologies and, in the process, develop techniques and understanding broadly applicable to the study of solid-state quantum emitters. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: SC0020115; NA0003525
• OSTI ID: 2459370
• Journal Information: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 4 Vol. 14; ISSN PRXHAE; ISSN 2160-3308
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English