Entanglement between two atoms in the system of Schr(o)dinger cat state interacting with two entangled atoms

• 来源期刊: 中国物理B（英文版）
• 关键词: negative eigenvalues entanglement state Schr(o)dinger cat state
• 年，卷（期）: 2007,（11）
• 页码范围: 3396-3401
• 页数: 6页
• 语种: 英文

摘要

By the negative eigenvalues of partial transposition of density matrix, this paper investigates the time evolution of entanglement of the two entangled atoms in the system of two atoms interacting with Schr(o)dinger cat state. The result shows that the two atoms are always in the entanglement state, and the degree of entanglement between the two atoms exhibits ordinary collapses and revivals at 0.2 degree of entanglement, when the light field is large enough. On the other hand, the reinforcement of three different light fields on the degree of entanglement between two atoms is not evident.