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

We study the synchronization of a superconducting qubit to an external optical field via a mechanical resonator in a hybrid electrooptomechanical 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 prepare and monitor the state of the microwave qubit 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.

Automated summary

We investigate the synchronization between a superconducting qubit and an external optical field in a hybrid electrooptomechanical system using the quantum trajectory method. Bistability is observed in the qubit's polarization vector, where the qubit rotates around the vector. With an increased number of trajectories, the qubit no longer displays bistability but still shows synchronization with reduced quantum fluctuations. This scheme can be applied for preparing and monitoring the state of the microwave qubit to an optical photon, which has potential applications in long-distance quantum communication. Additionally, it provides a platform for studying quantum synchronization.