Eur. Phys. J. D 35, 553-560 (2005)
https://doi.org/10.1140/epjd/e2005-00083-y

Entanglement and Bell violation with phase decoherence or dissipation

¹ Chinese Center of Advanced Science and Technology (World Laboratory), P.O. Box 8730, Beijing, P.R. China
² Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, P.R. China

Corresponding author: ^a phyxujb@mail.hz.zj.cn

Received: 21 July 2004
Revised: 24 September 2004
Published online: 7 June 2005

Abstract

The system of an atom couples to two distinct optical cavities with decoherence is studied by making use of a dynamical algebraic method. We adopt the concurrence to characterize the entanglement between atom and cavities or between two optical cavities in the presence of the phase decoherence or dissipation. It is found that the entanglement between atom and cavities can be controlled by adjusting the detuning parameter. We show that even if the atom is initially prepared in a maximally mixed state, it can also entangle the two mode cavity fields. Finally, the Bell violation of the cavity fields is discussed, and it is shown that both the detuning and decoherence can deteriorate the maximal amount of violation of Bell inequality for two mode cavity fields during the evolution.