Efficient coupling of optically active qubits to optical cavities is a key challenge for solid-state-based quantum optics experiments and future quantum technologies. Here we present a quantum photonic interface based on a single tin-vacancy center in a micrometer-thin diamond membrane coupled to a tunable open microcavity. We use the full tunability of the microcavity to selectively address individual tin-vacancy centers within the cavity mode volume. Purcell enhancement of the tin-vacancy center optical transition is evidenced both by optical excited state lifetime reduction and by optical linewidth broadening. As the emitter selectively reflects the single-photon component of the incident light, the coupled emitter-cavity system exhibits strong quantum nonlinear behavior. On resonance, we observe a transmission dip of 50% for low incident photon number per Purcell-reduced excited state lifetime, while the dip disappears as the emitter is saturated with higher photon number. Moreover, we demonstrate that the emitter strongly modifies the photon statistics of the transmitted light by observing photon bunching. This work establishes a versatile and tunable platform for advanced quantum optics experiments and proof-of-principle demonstrations on quantum networking with solid-state qubits.

中文翻译：

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金刚石锡空位中心与可调开孔微腔的相干耦合


光活性量子比特与光腔的高效耦合是基于固态的量子光学实验和未来量子技术的关键挑战。在这里，我们提出了一个量子光子界面，该界面基于微米级薄的金刚石膜中的单个锡空位中心，该膜与可调谐的开放微腔耦合。我们利用微腔的完全可调性来选择性地处理腔模式体积内的各个锡空位中心。锡空位中心光跃迁的 Purcell 增强通过光激发态寿命的缩短和光线宽展宽来证明。由于发射器选择性地反射入射光的单光子分量，耦合的发射器腔系统表现出很强的量子非线性行为。在共振时，我们观察到每个 Purcell 减少的激发态寿命中，低入射光子数的透射率下降了 50%，而当发射器被较高的光子数饱和时，这种下降消失了。此外，我们证明了发射器通过观察光子聚集强烈地改变了透射光的光子统计数据。这项工作为高级量子光学实验和固态量子比特量子网络的原理验证演示建立了一个多功能且可调的平台。