Integrating superconducting qubits with phononic devices

Hybrid superconducting-phononic devices could be a central element in forming quantum networks, an outstanding challenge in quantum information science. Recently, phononic modes that have lifetimes on the order of 1s have been demonstrated in phononic resonators in Si, exceeding the coherence lifetime of any superconducting circuit. Due to their ability to support high-Q at gigahertz-frequency operation, phononic devices in silicon-based platforms are an ideal contender for monolithic integration with superconducting qubits, where phonon-qubit coupling can be mediated via piezoelectric transduction. In this work, we will present our experimental results developing superconducting qubits on a SiC material platform to realize a hybrid superconducting-phononic device.