Silicon-Vacancy Spin Qubit in Diamond: A Quantum Memory Exceeding 10 ms with Single-Shot State Readout

D. D. Sukachev, A. Sipahigil, C. T. Nguyen, M. K. Bhaskar, R. E. Evans, F. Jelezko, and M. D. Lukin
Phys. Rev. Lett. 119, 223602 – Published 29 November 2017
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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 (250ns) 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 T2 of 13 ms and a spin relaxation time T1 exceeding 1 s at 100 mK. These results establish the SiV as a promising solid-state candidate for the realization of quantum networks.

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  • Received 29 August 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.223602

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied PhysicsGeneral Physics

Authors & Affiliations

D. D. Sukachev1,*, A. Sipahigil1, C. T. Nguyen1, M. K. Bhaskar1, R. E. Evans1, F. Jelezko2, and M. D. Lukin1,†

  • 1Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
  • 2Institute for Quantum Optics, Ulm University and Center for Integrated Quantum Science and Technology, Albert-Einstein-Allee 11, 89081 Ulm, Germany

  • *sukachev@fas.harvard.edu
  • lukin@physics.harvard.edu

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Issue

Vol. 119, Iss. 22 — 1 December 2017

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