Photon-subtracted squeezed thermal state: Nonclassicality and decoherence
Photon-subtracted squeezed thermal state: Nonclassicality and decoherence
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光子扣除压缩热态:非经典性和退相干
DOI:
10.1103/physreva.82.043842
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发表时间:
2010-08
期刊:
影响因子:
--
通讯作者:
Xue-fen Xu
中科院分区:
文献类型:
--
作者:
Li-yun Hu;Xue-xiang Xu;Zi-sheng Wang;Xue-fen Xu
We investigate nonclassical properties of the field states generated by subtracting any number of photons from the squeezed thermal state (STS). It is found that the normalization factor of photon-subtracted STS (PSSTS) is a Legendre polynomial of squeezing parameter r and average photon number n-bar of the thermal state. Expressions of several quasiprobability distributions of PSSTS are derived analytically. Furthermore, the nonclassicality is discussed in terms of the negativity of the Wigner function (WF). It is shown that the WF of single PSSTS always has negative values if n-bar<sinh{sup 2}r at the phase space center. The decoherence effect on PSSTS is then included by analytically deriving the time evolution of WF. The results show that the WF of single PSSTS has negative value if 2{kappa}t<ln{l_brace}1-(2n-bar+1)(n-bar-sinh{sup 2}r)/[(2N+1)(n-barcosh2r+sinh{sup 2}r)]{r_brace}, which is dependent not only on average number N of thermal photons in the environment, but also on n-bar and r.
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DOI:
10.1007/978-3-540-70626-7_31
发表时间:
2009-03
期刊:
--
影响因子:
--
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通讯作者:
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期刊:
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影响因子:
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期刊:
--
影响因子:
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