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

Kavli Affiliate: Ronald Hanson

| First 5 Authors: Yanik Herrmann, Julius Fischer, Stijn Scheijen, Cornelis F. J. Wolfs, Julia M. Brevoord

| Summary:

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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