Superconducting Qubits Coupled to Torsional Resonators

TL;DR

This paper proposes a method for achieving strong, tunable coupling between a superconducting phase qubit and a nanomechanical torsional resonator, enabling control over quantum correlations in the system.

Contribution

It introduces a novel scheme where the torsional resonator directly modulates the Josephson energy, resulting in a large, tunable coupling strength.

Findings

Strong and tunable coupling achieved

Quantum correlation effects analyzed

Coupling modulates Josephson energy directly

Abstract

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