Microwave-optical transduction at milli-Kelvin temperatures using hybrid bulk acoustic resonances

Efficient microwave-optical quantum conversion is necessary for the large-scale integration of superconducting qubits into telecom fiber-optic networks and heterogeneous quantum networking hardware. Here, we study a piezo-optomechanical transducer based on hybrid bulk acoustic resonances (HBARs)[1-3] in a dilution refrigerator at 10 mK. Optical and microwave drives are pulsed to enable high peak pump powers while minimizing the local thermal load on the transducer. We will present our latest measurements characterizing the conversion efficiency of this new platform and discuss next steps in boosting the efficiency, including experimental upgrades and investigating new devices with higher optomechanical coupling.

[1] H. Tian et al. Nature Communications volume 11, 3073 (2020)

[2] T. Blesin et al. Phys. Rev. A 104, 052601 (2021)

[3] T. Blesin et al. arXiv:2308.02706 (2023)