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 towards spin-photon entanglement schemes. Here, we demonstrate multi-axis 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 $\Omega/2\pi$=3.6(1) MHz. All-optical Ramsey interferometry reveals a spin dephasing time of $T_2^*$=1.3(3)$\mu$s and two-pulse dynamical decoupling already extends the spin coherence time to $T_2$=0.33(14) 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.
Highlights
A light-matter quantum interface combines deterministic and coherent generation of single photons with a long-lived matter qubit [1,2,3,4]
We demonstrate the flexibility of the all-optical approach by implementing coherent population trapping, optical Rabi driving, Ramsey interferometry, and dynamical decoupling of the SnV spin qubit
Carrying over the operational advantages that are common to the previously investigated group-IV color centers, such as a large Debye-Waller factor [36], transform-limited photon generation [46], and integration into photonic nanostructures enabled by their symmetry [68,69], the SnV brings two additional advantages
Summary
A light-matter quantum interface combines deterministic and coherent generation of single photons with a long-lived matter qubit [1,2,3,4]. Times up to 13 ms [56] allow for more mature demonstrations of entanglement [49,57,58] Building on these achievements, the recently reported tin-vacancy center (SnV) [44,45,46,59] shares the desirable optical properties of SiV—large Debye-Waller factor of approximately 0.6 [60] with transform-limited photons [46]—and provides the additional advantages of (1) a long spin lifetime of 10 ms at 3.25 K (extrapolated to >1 s at 1.7 K) [46] and (2) optical cyclicity in the presence of an off-axis magnetic field or strain, which can allow for simultaneous highquality single-shot readout and efficient coupling to nuclear spins. These results confirm the promise of SnV as a competitive nextgeneration light-matter quantum interface
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