The effect of dipole-dipole interaction for two atoms with different couplings in non-Markovian environment

TL;DR

This paper investigates how dipole-dipole interactions influence the entanglement dynamics of two atoms in a non-Markovian environment, revealing conditions for steady states and the impact of interaction strength on entanglement preservation.

Contribution

It provides an exact analysis of entanglement evolution considering different coupling strengths and dipole interactions in a non-Markovian setting, which is novel.

Findings

Strong dipole-dipole interaction suppresses initial disentanglement.

Dipole interaction can destroy steady-state entanglement.

Conditions for existence of steady states are identified.

Abstract

Using the nonperturbative method, we study the exact entanglement dynamics of two two-level dipole-dipole interacting atoms coupled to a common non-Markovian reservoir with different coupling strengths. Besides analyzing the conditions for the existence of steady state, we find, though the dipole-dipole interaction could destroy the stationary entanglement, that relatively strong dipole-dipole interaction does suppress the disentanglement in the initial period of time. These results are helpful for the practical engineering of the entanglement in the future.