The negatively charged tin-vacancy (SnV-) center in diamond is a promising solid-state qubit for applications in quantum networking due to its high quantum efficiency, strong zero phonon emission, and reduced sensitivity to electrical noise. The SnV- has a large spin-orbit coupling, which allows for long spin lifetimes at elevated temperatures, but unfortunately suppresses the magnetic dipole transitions desired for quantum control. Here, by use of a naturally strained center, we overcome this limitation and achieve high-fidelity microwave spin control. We demonstrate a pi-pulse fidelity of up to 99.51+/0.03%$ and a Hahn-echo coherence time of T2echo = 170.0+/-2.8 microseconds, both the highest yet reported for SnV- platform. This performance comes without compromise to optical stability, and is demonstrated at 1.7 Kelvin where ample cooling power is available to mitigate drive induced heating. These results pave the way for SnV- spins to be used as a building block for future quantum technologies.
@article{arxiv.2306.13199,
title = {Microwave Spin Control of a Tin-Vacancy Qubit in Diamond},
author = {Eric I. Rosenthal and Christopher P. Anderson and Hannah C. Kleidermacher and Abigail J. Stein and Hope Lee and Jakob Grzesik and Giovanni Scuri and Alison E. Rugar and Daniel Riedel and Shahriar Aghaeimeibodi and Geun Ho Ahn and Kasper Van Gasse and Jelena Vuckovic},
journal= {arXiv preprint arXiv:2306.13199},
year = {2023}
}