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

TL;DR

This paper demonstrates a tunable microcavity coupled to a single Tin-Vacancy center in diamond, showing enhanced emission and quantum nonlinear effects, advancing solid-state quantum optics and potential quantum network applications.

Contribution

It introduces a versatile, tunable platform for coupling solid-state qubits to optical cavities, enabling selective addressing and strong quantum nonlinear interactions.

Findings

Purcell enhancement evidenced by lifetime reduction

50% transmission dip on resonance at low photon numbers

Photon bunching observed indicating modified photon statistics

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.