Three-body entanglement induced by spontaneous emission in a three two-level atoms system  

作　　者：廖湘萍 方卯发 郑小娟 蔡建武 

机构地区：[1]College of Physics and Information Science, Hunan Normal University, Changsha 410081, China [2]Department of Physics and Electronics, Zhuzhou Teacher College, Zhuzhou 412007, China

出　　处：《Chinese Physics B》2006年第2期353-364,共12页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 10374025） and the Young Scientific Research Poundation of Hunan Provincial Education Department （Grand No 04B070）.

摘　　要：We study three-body entanglement induced by spontaneous emission in a three two-level atoms system by using the entanglement tensor approach. The results show that the amount of entanglement is strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherent superposition of the two-body entanglements. The larger the two-body entanglement is, the stronger the three-body entanglement is. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak. We also find that the maximum of the two-body entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms via adjusting the difference in atomic frequency.We study three-body entanglement induced by spontaneous emission in a three two-level atoms system by using the entanglement tensor approach. The results show that the amount of entanglement is strongly dependent on the initial state of the system and the species of atoms. The three-body entanglement is the result of the coherent superposition of the two-body entanglements. The larger the two-body entanglement is, the stronger the three-body entanglement is. On the other hand, if there exists a great difference in three two-body entanglement measures, the three-body entanglement is very weak. We also find that the maximum of the two-body entanglement obtained with nonidentical atoms is greater than that obtained with identical atoms via adjusting the difference in atomic frequency.

关 键 词：spontaneous emission entanglement measures 

分 类 号：O562[理学—原子与分子物理]