Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process  

作　　者：刘小娟 周并举 刘明伟 李寿存 

机构地区：[1]Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China [2]Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

出　　处：《Chinese Physics B》2007年第12期3685-3691,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 19874020）, the Natural Science Foundation of Hunan Province, China （Grant No 05JJ30004）, and the Scientific Research Fund of Hunan Provincial Education Department, China（Grant No 03c543）.

摘　　要：We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properties between the two-mode coherent fields and a moving two-level atom by using the quantum reduced entropy, and those between the two-mode coherent fields by using the quantum relative entropy. In addition, we examine the influences of the atomic motion and field-mode structure parameter p on the quantum entanglement of the system. Our results show that the period and the duration of the prepared maximal atom-field entangled states and the frequency of maximal two-mode field entangled states can be controlled, and that a sustained entangled state of the two-mode field, which is independent of atomic motion and the evolution time, can be obtained, by choosing appropriately the parameters of atomic motion, field-mode structure, initial state and interaction time of the system.We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properties between the two-mode coherent fields and a moving two-level atom by using the quantum reduced entropy, and those between the two-mode coherent fields by using the quantum relative entropy. In addition, we examine the influences of the atomic motion and field-mode structure parameter p on the quantum entanglement of the system. Our results show that the period and the duration of the prepared maximal atom-field entangled states and the frequency of maximal two-mode field entangled states can be controlled, and that a sustained entangled state of the two-mode field, which is independent of atomic motion and the evolution time, can be obtained, by choosing appropriately the parameters of atomic motion, field-mode structure, initial state and interaction time of the system.

关 键 词：two-mode coherent fields entangled states reduced entropy relative entropy atomic motion and field-mode structure 

分 类 号：O44[理学—电磁学]