类金刚石微腔中锡-空位色心的高协同耦合与自旋分辨消光
High-cooperativity coupling and spin-resolved extinction of tin-vacancy centers in a diamond-like microcavity
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中文总结 AI 辅助
本研究在可调谐法布里-珀罗微腔中实现金刚石SnV色心的高协同耦合，获96%消光对比度与0.91自旋分辨对比度，证实其为高效自旋-光子接口的有潜力平台。
中文摘要 AI 辅助
金刚石中的锡-空位（SnV）色心是极具潜力的量子网络用自旋-光子接口，兼具优异的光学特性与1K以上的自旋相干性。要充分发挥其潜力，需借助腔增强提升光子-发射器耦合效率。本研究在可完全调谐的法布里-珀罗微腔中实现了SnV色心的腔增强光-物质耦合，该微腔可在低至1K的温度下工作，且具备原位磁场控制能力。通过整合低粗糙度金刚石膜，我们获得了混合腔模的类金刚石 regime，其中场被集中在金刚石内部，珀塞尔增强达到最大化。类金刚石模式的有效珀塞尔因子较类空气模式提升了两倍以上，达到$C_0 = 4.1(1)$，而类空气模式的$C_0$为1.85(5)，同时还放宽了机械稳定性要求。共振探测显示腔-发射器相干耦合的消光对比度达96%，相干协同度为$C = 4.0(14)$。通过施加磁场，我们进一步实现了自旋分辨的腔消光，观测到自旋选择光跃迁的对比度${\textstyle {\rm {\bf {\textit {C}}}}}_{\rm spin} = 0.91$。这些结果表明，耦合到开放法布里-珀罗微腔的金刚石SnV色心是实现高效自旋-光子接口的有潜力平台。
英文摘要
The tin-vacancy (SnV) center in diamond is a promising spin-photon interface for quantum networks, combining favorable optical properties with spin coherence above 1K. Unfolding the full potential requires cavity enhancement to increase photon-emitter coupling efficiency. Here, we demonstrate cavity-enhanced light-matter coupling of SnV centers in a fully tunable Fabry-Pérot microcavity operating at temperatures down to 1K with in-situ magnetic field control. We access the diamond-like regime of hybrid cavity modes through integration of low-roughness diamond membranes, where the field is concentrated inside the diamond and Purcell enhancement is maximized. Diamond-like modes deliver a more than two-fold increase in the effective Purcell factor over air-like modes, reaching $C_0 = 4.1(1)$ compared to $C_0 = 1.85(5)$ in the air-like case, while simultaneously relaxing mechanical stability requirements. Resonant probing reveals coherent cavity-emitter coupling with 96% extinction contrast and a coherent cooperativity of $C = 4.0(14)$. By applying a magnetic field, we further achieve spin-resolved cavity extinction, observing spin-selective optical transitions with a contrast of ${\cal C}_{\rm spin} = 0.91$. These results establish SnV centers in diamond coupled to open Fabry-Pérot microcavities as a promising platform for efficient spin-photon interfaces.
