Steady-State Entanglement for Distant Atoms by Dissipation in Coupled Cavities

TL;DR

This paper presents a dissipation-based scheme to generate robust, high-fidelity steady-state entanglement between two atoms in separate coupled cavities, outperforming traditional unitary protocols.

Contribution

It introduces a novel method leveraging dissipation and classical fields to produce steady entanglement with high fidelity, independent of initial states.

Findings

High-fidelity steady entanglement achievable regardless of initial conditions

Entanglement robustness against parameter fluctuations

Quadratic improvement in fidelity scaling compared to unitary methods

Abstract

We propose a scheme for the generation of entangled states for two atoms trapped in separate cavities coupled to each other. The scheme is based on the competition between the unitary dynamics induced by the classical fields and the collective decays induced by the dissipation of two delocalized field modes. Under certain conditions, the symmetric or asymmetric entangled state is produced in the steady state. The analytical result shows that the distributed steady entanglement can be achieved with high fidelity independent of the initial state, and is robust against parameter fluctuations. We also find out that the linear scaling of $F$ has a quadratic improvement compared to distributed entangled state preparation protocols based on unitary dynamics.