Abstract
The negatively charged silicon-vacancy () color center in diamond has recently emerged as a promising system for quantum photonics. Its symmetry-protected optical transitions enable the creation of indistinguishable emitter arrays and deterministic coupling to nanophotonic devices. Despite this, the longest coherence time associated with its electronic spin achieved to date () has been limited by coupling to acoustic phonons. We demonstrate coherent control and suppression of phonon-induced dephasing of the electronic spin coherence by 5 orders of magnitude by operating at temperatures below 500 mK. By aligning the magnetic field along the symmetry axis, we demonstrate spin-conserving optical transitions and single-shot readout of the spin with 89% fidelity. Coherent control of the spin with microwave fields is used to demonstrate a spin coherence time of 13 ms and a spin relaxation time exceeding 1 s at 100 mK. These results establish the as a promising solid-state candidate for the realization of quantum networks.
- Received 29 August 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.223602
© 2017 American Physical Society