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THU: Thursday Contributed Sessions

THU 5: QIP Implementations: Interfaces

THU 5.2: Talk

Thursday, September 11, 2025, 14:30–14:45, ZHG006

An Efficient Spin-Photon Interface for Tin-Vacancy Centers in Diamond — •Kerim Köster¹, Andras Lauko¹, Philipp Graßhoff², Dominic Reinhardt³, Thomas Hümmer⁴, Cyril Popov², Jan Meijer³, and David Hunger¹ — ¹Karlsruher Institut für Technologie — ²Uni Kassel — ³Uni Leipzig — ⁴Qlibri GmbH

The realization of long-distance quantum networks requires efficient interfaces of photons and stationary memories. The Tin-Vacancy (SnV) center in diamond emerged as a promising solid-state based spin photon interface, featuring spin-selective optical transitions, long memory times and efficient spin control. However, scaling to multi-node networks remains challenging, as they rely on the efficient coupling between these defect centers and optical cavities. Here, we present the integration of single addressable SnV centers in a micrometer-thin membrane into an open, fully tuneable and cryogenic microcavity to attain emission enhancement in a single optical mode. The cavity platform operates within a dilution cryostat at temperatures around 1K, featuring a passive mechanical stability below 10 pm. We observe a significant Purcell-induced lifetime shortening, indicating strong light-matter interaction. The system operates in the high-cooperativity regime, which allows us to probe the coherent coupling evidenced by emitter-induced extinction in the transmission profile of the cavity. Our platform further supports the integration of a superconducting magnet and a microwave antenna, enabling spin readout and coherent control. This represents a significant step towards realizing an efficient spin-photon interface for group IV color centers in diamond.

Keywords: SnV; Cavity; Color Centers; Purcell