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

doi:10.1088/1674-1056/26/12/120301

Abstract 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 κ 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.

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

Received: 20 June 2017
Revised: 13 August 2017
Accepted manuscript online:

PACS:	03.65.-w	(Quantum mechanics)
	42.50.Dv	(Quantum state engineering and measurements)
	03.65.Wj	(State reconstruction, quantum tomography)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11347026) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2016AM03 and ZR2017AM011).

Corresponding Authors: Ji-Suo Wang
E-mail: jswang@qfnu.edu.cn

Cite this article:

Chuan-Xun Du(杜传勋), Xiang-Guo Meng(孟祥国), Ran Zhang(张冉), Ji-Suo Wang(王继锁) Analytical and numerical investigations of displaced thermal state evolutions in a laser process 2017 Chin. Phys. B 26 120301

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