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

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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Cited by in corpus (2)

• Control of solid-state nuclear spin qubits using an electron spin-1/2
• High-fidelity control of a ${}^{13}$C nuclear spin coupled to a tin-vacancy center in diamond