Towards efficient quantum transduction between microwave and optical photons with hybrid hardware and hybrid protocols

The hybrid approach of combining superconducting and photonic quantum technologies promises to realize large-scale quantum networks, where quantum information is processed by superconducting circuits and transmitted with optical photons. Quantum transducers, which coherently interface superconducting and photonic circuits, is indispensable for this approach. To reach the ideal performance with high quantum capacity, low added noise, and large conversion bandwidth, innovations in both the transduction hardware and protocols are required. In this talk, I will present our recent advances in exploring new transduction hardware platforms based on cavity electro-optical and cavity piezo-optomechanical systems. Moreover, I will introduce novel transduction protocols beyond the simple direct conversion scheme. By leveraging advanced methods such as continuous-variable teleportation, parametric amplification, and quantum information pre/post-processing, the transduction capacity can be increased with the same hardware performance.