Superconducting qubits for phononic integration

Hybrid superconducting-phononic systems are a promising platform for quantum information processing. While there have been advances developing superconducting quantum processors, many challenges remain such as, long distance quantum coherent transmission and memory. Phononic resonators in thin silicon membranes can have lifetimes in excess of 1 second, far exceeding the lifetime of any on-chip superconducting circuit. The phononic modes can be frequency matched to superconducting circuits and wavelength matched to optical modes, providing a path for quantum networking via an optical channel. Thus, hybrid superconducting-phononic systems potentially address these long-standing challenges. Here, we present our experimental results developing superconducting qubits on material platforms for phononic integration. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.