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

• URL: http://arxiv.org/abs/2403.13110v2
• Date: Tue, 08 Oct 2024 22:06:51 GMT
• Title: Single-Shot Readout and Weak Measurement of a Tin-Vacancy Qubit in Diamond
• Authors: Eric I. Rosenthal, Souvik Biswas, Giovanni Scuri, Hope Lee, Abigail J. Stein, Hannah C. Kleidermacher, Jakob Grzesik, Alison E. Rugar, Shahriar Aghaeimeibodi, Daniel Riedel, Michael Titze, Edward S. Bielejec, Joonhee Choi, Christopher P. Anderson, Jelena Vuckovic,
• Abstract summary: The negatively charged tin-vacancy center in diamond (SnV$-$) is an emerging platform for building the next generation of long-distance quantum networks. Here, we demonstrate measurement of a single SnV$-$ electronic spin with a single-shot readout fidelity of $87.4%$.
• Score: 2.8091212912045185
• License:
• Abstract: The negatively charged tin-vacancy center in diamond (SnV$^-$) is an emerging platform for building the next generation of long-distance quantum networks. This is due to the SnV$^-$'s favorable optical and spin properties including bright emission, insensitivity to electronic noise, and long spin coherence times at temperatures above 1 Kelvin. Here, we demonstrate measurement of a single 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. We show this performance is compatible with rapid microwave spin control, demonstrating that the trade-off between optical readout and spin control inherent to group-IV centers in diamond can be overcome for the SnV$^-$. Finally, we use weak quantum measurement to study measurement induced dephasing; this illuminates the fundamental interplay between measurement and decoherence in quantum mechanics, and makes use of the qubit's spin coherence as a metrological tool. Taken together, these results overcome an important hurdle in the development of the SnV$^-$ based quantum technologies, and in the process, develop techniques and understanding broadly applicable to the study of solid-state quantum emitters.

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