A Low-Temperature Tunable Microcavity featuring High Passive Stability and Microwave Integration

• URL: http://arxiv.org/abs/2409.01857v2
• Date: Wed, 18 Dec 2024 15:31:58 GMT
• Title: A Low-Temperature Tunable Microcavity featuring High Passive Stability and Microwave Integration
• Authors: Yanik Herrmann, Julius Fischer, Stijn Scheijen, Cornelis F. J. Wolfs, Julia M. Brevoord, Colin Sauerzapf, Leonardo G. C. Wienhoven, Laurens J. Feije, Martin Eschen, Maximilian Ruf, Matthew J. Weaver, Ronald Hanson,
• Abstract summary: This work presents a closed-cycle cryogenic fiber-based microcavity setup, which is in particular designed for a low passive vibration level. At temperatures below 10 Kelvin, a stability level of around 25 picometer is reproducibly achieved in different setup configurations.
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• Abstract: Open microcavities offer great potential for the exploration and utilization of efficient spin-photon interfaces with Purcell-enhanced quantum emitters thanks to their large spectral and spatial tunability combined with high versatility of sample integration. However, a major challenge for this platform is the sensitivity to cavity length fluctuations in the cryogenic environment, which leads to cavity resonance frequency variations and thereby a lowered averaged Purcell enhancement. This work presents a closed-cycle cryogenic fiber-based microcavity setup, which is in particular designed for a low passive vibration level, while still providing large tunability and flexibility in fiber and sample integration, and high photon collection efficiency from the cavity mode. At temperatures below 10 Kelvin, a stability level of around 25 picometer is reproducibly achieved in different setup configurations, including the extension with microwave control for manipulating the spin of cavity-coupled quantum emitters, enabling a bright photonic interface with optically active qubits.

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