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

• DOI: 10.48550/arxiv.2403.13110
• Publication Date: 2024-10-08
• Authors: Eric I. Rosenthal; Souvik Biswas; Giovanni Scuri; Hope Lee; Abigail J. Stein; Hannah C. Kleider...; Jakob Grzesik; Alison E. Rugar; Shahriar Aghaeime...; Daniel Riedel; Michael Titze; Edward S. Bielejec; Joonhee Choi; Christopher P. An...; Jelena Vučković
• Keywords: Quantum Physics; Physics; QC1-999; FOS: Physical sciences; Quantum Physics (quant-ph)

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 K. 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. 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 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 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