Quantum Control of the Tin-Vacancy Spin Qubit in Diamond
Romain Debroux (University of Cambridge)
Cathryn P. Michaels (University of Cambridge)
Carola M. Purser (University of Cambridge)
Noel Wan (Massachusetts Institute of Technology)
Matthew E. Trusheim (Massachusetts Institute of Technology)
Jesús Arjona Martínez (University of Cambridge)
Ryan A. Parker (University of Cambridge)
Kevin C. Chen (Massachusetts Institute of Technology)
Lorenzo De Santis (Massachusetts Institute of Technology, TU Delft - QID/Hanson Lab)
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Abstract
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 T2∗=1.3(3) μs, and four-pulse dynamical decoupling already extends the spin-coherence time to T2=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.
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