Synchronization of a superconducting qubit to an optical field mediated by a mechanical resonator

TL;DR

This paper investigates how a superconducting qubit can synchronize with an external optical field through a mechanical resonator, revealing bistability and synchronization phenomena with potential applications in quantum communication.

Contribution

It introduces a method to achieve and analyze quantum synchronization in a hybrid optoelectromechanical system using quantum trajectory simulations.

Findings

Bistability observed in qubit polarization vectors for single trajectories.

Synchronization persists with reduced quantum fluctuations when averaging over many trajectories.

Potential for transferring qubit phase information to optical photons for quantum communication.

Abstract

We study the synchronization of a superconducting qubit to an external optical field via a mechanical resonator in a hybrid optoelectromechanical system. The quantum trajectory method is employed to investigate synchronization. The bistability in one of the qubit polarization vectors, where the qubit rotates about the polarization vector, is observed for a single quantum trajectory run. The rotation in one of the stable states is synced with the external optical drive. When the number of trajectories is significantly increased, the qubit no longer displays bistability. However, synchronization with less quantum fluctuations is still observed. The scheme could be used to transfer the phase of the microwave qubit's rotation to a long-lived optical photon through synchronization, which may find applications in long-distance quantum communication. Also, this hybrid system can be used to study quantum synchronization.