Group-IV color centers in diamond are a promising light-matter interface for quantum networking devices. The negatively charged tin-vacancy center ($\mathrm{Sn}\mathrm{V}$) 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 $\mathrm{Sn}\mathrm{V}$ 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 $\mathrm{\Omega }/2\pi =19.0(1)\mathrm{MHz}$. All-optical Ramsey interferometry reveals a spin dephasing time of $T_2^{*}=1.3(3)\mu \mathrm{s}$, and four-pulse dynamical decoupling already extends the spin-coherence time to $T_2=0.30(8)\mathrm{ms}$. Combined with transform-limited photons and integration into photonic nanostructures, our results make the $\mathrm{Sn}\mathrm{V}$ a competitive spin-photon building block for quantum networks.

中文翻译：

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金刚石中锡空位自旋量子位的量子控制

金刚石中的 IV 族色心是用于量子网络设备的有前途的光物质界面。带负电的锡空位中心 ($锡\mathrm{伏}$) 特别有趣，因为它的大自旋轨道耦合提供了强大的保护，防止声子移相和其向自旋光子纠缠方案的光学跃迁的稳健循环。在这里，我们展示了多轴相干控制$锡\mathrm{伏}$通过基态和激发态之间的全光受激拉曼驱动自旋量子比特。我们使用相干布居俘获和光学驱动的电子自旋共振来确认对 1.7 K 量子位的相干访问，并以$\mathrm{\Omega }/2\pi =19.0(1)\mathrm{兆赫}$. 全光拉姆齐干涉测量法显示自旋移相时间为${吨}_2^{*}=1.3(3)\mu \mathrm{秒}$，四脉冲动态去耦已经将自旋相干时间延长至 ${吨}_2=0.30(8)\mathrm{多发性硬化症}$. 结合变换受限的光子和集成到光子纳米结构中，我们的结果使$锡\mathrm{伏}$ 用于量子网络的竞争性自旋光子构建块。