Superconducting qubits coupled to torsional resonators

Abstract

We propose a scheme of strong and tunable coupling between a superconducting phasequbit and a nanomechanical torsional resonator. In our scheme the torsional resonatordirectly modulates the largest energy scale (the Josephson coupling energy) of the phasequbit, and the coupling strength is very large. We analyze the quantum correlation effectsin the torsional resonator as a result of the strong coupling to the phase qubit.