Quantum synchronization of qubits via dynamical Casimir effect

TL;DR

This paper demonstrates that the dynamical Casimir effect can induce synchronization between superconducting qubits in a cavity QED system, revealing unique independence of initial states and coupling strengths.

Contribution

It provides a theoretical and numerical analysis showing how photon generation via the dynamical Casimir effect leads to qubit synchronization with novel independence features.

Findings

Photon generation induces qubit synchronization.

Synchronization is unaffected by initial state differences.

Coupling strength differences do not influence synchronization.

Abstract

In this paper, we study the synchronization of qubits induced by the dynamical Casimir effect in an atom-cavity quantum electrodynamics system. Our investigation revolves around a pragmatic configuration of a quantum system, where two superconducting qubits are coupled to a shared coplanar waveguide resonator terminated at one end by a superconducting quantum interference device. The theoretical analyses of the system dynamics reveal sufficient conditions for ensuring synchronization which are anticipated to be accomplished by photon generation in the resonator. By numerically analyzing the time evolution of the system, we confirm that the conditions are satisfied by photon generation via the dynamical Casimir effect, resulting in qubit synchronization. Notably, we unveil a remarkable feature that is unique to synchronization induced by the dynamical Casimir effect: the differences in the initial states of qubits and the differences in the coupling strengths of qubits to an electromagnetic field affect the synchronization independently without overlap between these factors.