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

• 来源期刊: 中国物理B（英文版）
• 关键词: two-mode coherent fields entangled states reduced entropy relative entropy atomic motion and field-mode structure
• 年，卷（期）: 2007,（12）
• 页码范围: 3685-3691
• 页数: 7页
• 语种: 英文

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.