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Time-Evolution of Photon-Number Distribution and Density Operator of Squeezed Thermal State in the Thermal Environment |
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| Authors: | Ye-Jun Xu Xiang-Guo Meng |
| Institution: | 1. Department of Mechanical and Electronic Engineering, Chizhou University, Chizhou, Anhui, 247000, China 2. School of Physical Science and Information Engineering, Liaocheng University, Liaocheng, 252059, China 3. Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng, 252059, China |
| Abstract: | By virtue of the thermal entangled state representation, we analytically study time-dependent evolution of photon-number distribution and density operator of squeezed thermal state (STS) in the thermal environment. It is found that the initial density operator of STS still keeps squeezing and thermal within the thermal environment. At long times, such a state decays to thermal, a Gaussian classical state, as a result of decoherence. Moreover, the oscillations of photon-number distribution slowly disappear with increasing t, but the change of oscillations is completely different from that of STS in amplitude dissipative channel. |
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