Abstract
Extending the recent work completed by Biswas and Agarwal [Phys. Rev. A 75, 032104 (2007)] to the case of -photon-subtracted squeezed vacuum states (-PSSVSs), we focus our study on nonclassicality and decoherence of the -PSSVSs. The nonclassical properties are investigated in terms of the squeezing character, the oscillation of photon-number distribution, and the partial negativity of Wigner function (WF).We then study the effect of decoherence on the -PSSVSs in two different channels, viz., thermal process and phase damping. In each case, the time-evolution of density operators and WFs of such states is derived analytically. After undergoing the thermal channel, the initial pure -PSSVSs evolve into a mixed state that turns out to be a Laguerre polynomial of combination of creation and annihilation operators within normal ordering; however, they become another mixed state with the exponential decay due to phase damping. At long times, these fields decay to a highly classical thermal field as a result of thermal noise, but they still keep nonclassicality in the phase-damping channel.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Zhen Wang, Xiang-guo Meng, and Hong-yi Fan
J. Opt. Soc. Am. B 29(3) 397-406 (2012)
Xiang-guo Meng, Zhen Wang, Hong-yi Fan, Ji-suo Wang, and Zhen-shan Yang
J. Opt. Soc. Am. B 29(7) 1844-1853 (2012)
Xiang-guo Meng, Zhen Wang, Hong-yi Fan, and Ji-suo Wang
J. Opt. Soc. Am. B 29(7) 1835-1843 (2012)