Controlling entanglement sudden death in cavity QED by classical driving fields

TL;DR

This paper explores how classical driving fields can be used to control and prevent entanglement sudden death in a cavity QED system involving two-level atoms, enhancing entanglement longevity.

Contribution

It demonstrates that adjusting classical driving fields can effectively control entanglement dynamics and eliminate sudden death phenomena in cavity QED systems.

Findings

Classical driving fields can improve entanglement.

Strong classical fields can prevent entanglement sudden death.

Entanglement lifetime is controllable via classical field strength.

Abstract

We investigate the entanglement dynamics of a quantum system consisting of two-level atoms interacting with vacuum or thermal fields with classical driving fields. We find that the entanglement of the system can be improved by adjusting the classical driving field. The influence of the classical field and the purity of the initial state on the entanglement sudden death is also studied. It is shown that the time of entanglement sudden death can be controlled by the classical driving fields. Particularly, the entanglement sudden death phenomenon will disappear if the classical driving fields are strong enough.