Atom-field entanglement in the Jaynes Cummings model without rotating wave approximation

• 来源期刊: 中国物理B（英文版）
• 关键词: atom-photon interaction Jaynes-Cummings model quantum entanglement
• 年，卷（期）: 2015,（4）
• 页码范围: 040306-1-040306-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/4/040306

摘要

In this paper, we present a structure for obtaining the exact eigenfunctions and eigenvalues of the Jaynes–Cummings model (JCM) without the rotating wave approximation (RWA). We study the evolution of the system in the strong coupling region using the time evolution operator without RWA. The entanglement of the system without RWA is investigated using the Von Neumann entropy as an entanglement measure. It is interesting that in the weak coupling regime, the population of the atomic levels and Von Neumann entropy without RWA model shows a good agreement with the RWA whereas in strong coupling domain, the results of these two models are quite different.