Two atoms in dissipative cavities in dispersive limit: entanglement sudden death and long-lived entanglement

TL;DR

This paper studies how two atoms in dissipative cavities can experience temporary entanglement loss but retain some entanglement over time, with coherence preserved, revealing long-term entanglement dynamics.

Contribution

It demonstrates the occurrence of entanglement sudden death and the possibility of long-lived entanglement in dissipative cavity systems, highlighting entanglement preservation mechanisms.

Findings

Entanglement sudden death occurs within short interaction times.

Long-lived entanglement persists after extended interactions.

Atomic coherence remains intact during evolution.

Abstract

We investigate the entanglement dynamics and coherence of two two-level atoms interacting with two coherent fields of two spatially separated and dissipative cavities. It is in particular shown that entanglement sudden death is obtained within a short interacting time. However, after a long interaction time a long-lived entanglement is shown, that is, the initial entanglement of two atoms could be partially preserved. In addition, the coherence of the two atoms will not be lost during the evolution.