High-Overtone Bulk Acoustic Resonators (HBAR) as cryogenic high-frequency Acousto-optic Modulators

The efficient transduction of signals from the microwave (3-8 GHz) to the optical frequency domain is critical for interfacing superconducting qubits with light. Resonant acousto-optics is a natural route for achieving high transduction efficiency as both the optical and acoustic field are enhanced in the same cavity geometry. Traditionally, nanoscale optomechanical cavities with piezoelectric transducers have been pursued as the geometry of...