Physical Review X (Nov 2021)

Quantum Control of the Tin-Vacancy Spin Qubit in Diamond

  • Romain Debroux,
  • Cathryn P. Michaels,
  • Carola M. Purser,
  • Noel Wan,
  • Matthew E. Trusheim,
  • Jesús Arjona Martínez,
  • Ryan A. Parker,
  • Alexander M. Stramma,
  • Kevin C. Chen,
  • Lorenzo de Santis,
  • Evgeny M. Alexeev,
  • Andrea C. Ferrari,
  • Dirk Englund,
  • Dorian A. Gangloff,
  • Mete Atatüre

DOI
https://doi.org/10.1103/PhysRevX.11.041041
Journal volume & issue
Vol. 11, no. 4
p. 041041

Abstract

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Group-IV color centers in diamond are a promising light-matter interface for quantum networking devices. The negatively charged tin-vacancy center (SnV) is particularly interesting, as its large spin-orbit coupling offers strong protection against phonon dephasing and robust cyclicity of its optical transitions toward spin-photon-entanglement schemes. Here, we demonstrate multiaxis coherent control of the SnV spin qubit via an all-optical stimulated Raman drive between the ground and excited states. We use coherent population trapping and optically driven electronic spin resonance to confirm coherent access to the qubit at 1.7 K and obtain spin Rabi oscillations at a rate of Ω/2π=19.0(1) MHz. All-optical Ramsey interferometry reveals a spin dephasing time of T_{2}^{*}=1.3(3) μs, and four-pulse dynamical decoupling already extends the spin-coherence time to T_{2}=0.30(8) ms. Combined with transform-limited photons and integration into photonic nanostructures, our results make the SnV a competitive spin-photon building block for quantum networks.