Eur. Phys. J. D 51, 283-288 (2009)
https://doi.org/10.1140/epjd/e2008-00264-2

Controlling entanglement sudden death in cavity QED by classical driving fields

¹ Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, 310027, Hangzhou, P.R. China
² Institute of Optics, Department of Physics, Zhejiang University, 310027, Hangzhou, P.R. China

Corresponding author: ^a xujb@zju.edu.cn

Received: 26 August 2008
Revised: 15 October 2008
Published online: 20 December 2008

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.