Silicon-Vacancy Spin Qubit in Diamond - A Quantum Memory Exceeding 10 ms with Single-Shot State Readout
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2017-11-29 |
| Journal | Physical Review Letters |
| Authors | Denis D. Sukachev, Alp Sipahigil, C. T. Nguyen, Mihir K. Bhaskar, Ruffin E. Evans |
| Institutions | Harvard University, Center for Integrated Quantum Science and Technology |
| Citations | 420 |
Abstract
Section titled “Abstract”The negatively charged silicon-vacancy (SiV^{-}) 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 (∼250 ns) has been limited by coupling to acoustic phonons. We demonstrate coherent control and suppression of phonon-induced dephasing of the SiV^{-} electronic spin coherence by 5 orders of magnitude by operating at temperatures below 500 mK. By aligning the magnetic field along the SiV^{-} symmetry axis, we demonstrate spin-conserving optical transitions and single-shot readout of the SiV^{-} spin with 89% fidelity. Coherent control of the SiV^{-} spin with microwave fields is used to demonstrate a spin coherence time T_{2} of 13 ms and a spin relaxation time T_{1} exceeding 1 s at 100 mK. These results establish the SiV^{-} as a promising solid-state candidate for the realization of quantum networks.