Abstract

Extending the recent work completed by Biswas and Agarwal [Phys. Rev. A 75, 032104 (2007)] to the case of $m$-photon-subtracted squeezed vacuum states ($m$-PSSVSs), we focus our study on nonclassicality and decoherence of the $m$-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 $m$-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 $m$-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

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