Influence of Multi-Photon Process on Entanglement of Interacting System of the Qubit and Thermal Field

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2004,（5）
• 页码范围: 774-777
• 页数: 4页
• 语种: 英文

摘要

We study the system of a single qubit couples to a single mode thermal field according to a multi-photon JaynesCummings-type interaction with phase decoherence. Both the time evolving entanglement and the stationary state entanglement are calculated by adopting the log-negativity as a measure. It is found that the multi-photon process can enhance the stationary state entanglement of this system and can enlarge the range of the parameter△/g and the mean photon number of initial thermal field in which the stationary state is distillable.