Ground State of Jaynes-Cummings Model: Comparison of Solutions with and without the Rotating-Wave Approximation

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（4）
• 页码范围: 133-136
• 页数: 4页
• 语种: 英文

摘要

The eigenenergy spectrum of the Jaynes-Cummings (JC) model with and without the rotating-wave approx-imation (RWA) is investigated. The numerical analysis indicates that the non-RWA spectrum can only be approximated by the RWA in the range of sufficiently small coupling constant and detuning. In other region, the counter-rotating terms remarkably change the nature of the RWA energy spectrum. A simple expression with high accuracy for ground eigenenergy and eigenvector for non-RWA is available. The ground eigenvector for non-RWA shows that the ground state is not a dark state and very different from that of RWA which is a dark state.