Preparation and Decoherence of Two-Atom Entangled States in a Dissipative Cavity  

作　　者：向少华 宋克慧 

机构地区：[1]Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008 [2]Research Institute of Information Science, Huaihua University, Huaihua 418008

出　　处：《Chinese Physics Letters》2006年第4期768-771,共4页中国物理快报（英文版）

基　　金：Supported by the Natural Science Foundation of the Education Department of Hunan Province under Grant No 05C696.

摘　　要：We present a scheme for generating four pairs of two-atom Einstein Podolsky-Rosen （EPR） states using the simultaneous interaction of the two atoms with a single-mode cavity field under a large detuning condition. The influence of cavity dissipation on the prepared EPR states is investigated by means of the superoperator method and the state fidelity. It is shown that some kinds of the prepared EPR states are robust against cavity dissipation and the intensity of the field, and maintain their entanglement invariance, and the others are fragile and completely destroyed by the action of cavity dissipation and the intensity of the field in the long-time limit. Decoherence time of the fragile entangled states is extremely small for a typical cavity-QED experimental data.We present a scheme for generating four pairs of two-atom Einstein Podolsky-Rosen （EPR） states using the simultaneous interaction of the two atoms with a single-mode cavity field under a large detuning condition. The influence of cavity dissipation on the prepared EPR states is investigated by means of the superoperator method and the state fidelity. It is shown that some kinds of the prepared EPR states are robust against cavity dissipation and the intensity of the field, and maintain their entanglement invariance, and the others are fragile and completely destroyed by the action of cavity dissipation and the intensity of the field in the long-time limit. Decoherence time of the fragile entangled states is extremely small for a typical cavity-QED experimental data.

关 键 词：COHERENT STATES ATOMS GENERATION 

分 类 号：O562[理学—原子与分子物理] O41[理学—物理]