Coherent Coupling of a Diamond Tin-Vacancy Center to a Tunable Open Microcavity

Abstract

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 towards quantum networking with solid-state qubits.

15 pages, 12 figures

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• Homogeneous Free-Standing Nanostructures from Bulk Diamond over Millimeter Scales for Quantum Technologies
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• Profile control of fibre-based micro-mirrors using adaptive laser shooting with $\text{in situ}$ imaging
• A Low-Temperature Tunable Microcavity featuring High Passive Stability and Microwave Integration
• A Concise Primer on Solid-State Quantum Emitters
• Above-Unity Coherent Cooperativity of Tin-Vacancy Centers in Diamond Photonic Crystal Cavities
• High-fidelity control of a ${}^{13}$C nuclear spin coupled to a tin-vacancy center in diamond
• Purcell Enhancement and Suppression in Laser Cooling of Yb${}^{3+}$:YLF Nanocrystals in a Fabry-Pérot Microcavity
• Software Framework for Optically Accessible Quantum Memory Using Group-IV Color Centers in Diamond
• Laser-cut Patterned, Micrometer-thin Diamond Membranes with Coherent Color Centers for Open Microcavities
• Harnessing the Diamond-Air Interface as an Efficient Photon Antenna for Solid-State Emitters
• High-yield fabrication of micromirror templates via feedback-controlled laser ablation