The realization of quantum networks critically depends on establishing efficient, coherent light-matter interfaces. Optically active spins in diamond have emerged as promising quantum nodes based on their spin-selective optical transitions, long-lived spin ground states, and potential for integration with nanophotonics. Tin-vacancy (${\mathrm{SnV}}^{-}$) centers in diamond are of particular interest because they exhibit narrow-linewidth emission in nanostructures and possess long spin coherence times at temperatures above 1 K. However, a nanophotonic interface for ${\mathrm{SnV}}^{-}$ centers has not yet been realized. Here, we report cavity enhancement of the emission of ${\mathrm{SnV}}^{-}$ centers in diamond. We integrate ${\mathrm{SnV}}^{-}$ centers into one-dimensional photonic crystal resonators and observe a 40-fold increase in emission intensity. The Purcell factor of the coupled system is 25, resulting in a channeling of the majority of photons (90%) into the cavity mode. Our results pave the way for the creation of efficient, scalable spin-photon interfaces based on ${\mathrm{SnV}}^{-}$ centers in diamond.

中文翻译：

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金刚石中锡空位中心的量子光子接口

量子网络的实现关键取决于建立高效、相干的光物质界面。基于自旋选择性光学跃迁、长寿命自旋基态以及与纳米光子学集成的潜力，金刚石中的光学活性自旋已成为有前途的量子节点。锡空位 (${\mathrm{SV}}^{-}$) 金刚石中心是特别令人感兴趣的，因为它们在纳米结构中表现出窄线宽发射，并且在高于 1 K 的温度下具有长自旋相干时间。 ${\mathrm{SV}}^{-}$中心尚未实现。在这里，我们报告了发射的腔增强${\mathrm{SV}}^{-}$以钻石为中心。我们整合${\mathrm{SV}}^{-}$中心进入一维光子晶体谐振器并观察到发射强度增加了 40 倍。耦合系统的珀塞尔系数为 25，导致大部分光子 (90%) 进入腔模式。我们的结果为创建高效、可扩展的自旋光子界面铺平了道路${\mathrm{SV}}^{-}$ 以钻石为中心。