Analytical and numerical investigations of displaced thermal state evolutions in a laser process

作者：Du, Chuan-Xun; Meng, Xiang-Guo; Zhang, Ran; Wang, Ji-Suo^*

来源：Chinese Physics B, 2017, 26(12): 120301.

DOI：10.1088/1674-1056/26/12/120301

• displaced thermal state
• laser process
• infinitive operator-sum representation
• photon number
• Wigner function
• von Neumann entropy

We investigate how displaced thermal states (DTSs) evolve in a laser channel. Remarkably, the initial DTS, an example of a mixed state, still remains mixed and thermal. At long times, they finally decay to a highly classical thermal field only related to the laser parameters kappa and g. The normal ordering product of density operator of the DTS in the laser channel leads to obtaining the analytical time-evolution expressions of the photon number, Wigner function, and von Neumann entropy. Also, some interesting results are presented via numerically investigating these explicit time-dependent expressions.

• 单位
  曲阜师范大学; 聊城大学