M Times Photon Subtraction-Addition Coherent Superposition Operated Odd-Schrődinger-cat State: Nonclassicality and Decoherence

Abstract

We introduce a new non-Gaussian state, generated by m times coherent superposition operation $a\cos \theta +a^{†}{e}^{i\phi }\sin \theta$ (MCSO) on odd-Schrodinger-cat state (OSCS). Its normalized constant is turned out to be related with the Hermite polynomial. We further investigate the nonclassical properties of the MCSO-OSCS through Mandel's Q-parameter, quadrature squeezing, the photocount distribution and Wigner function (WF). It is shown that the nonclassicality of the MCSO-OSCS is influenced by the number of times (m) of coherent superpositon operation, the angle $\theta$ and the amplitude of the coherent state (|${\alpha }_0$|). Especially the volume of negative region of WF increases with the increment of parameters m, $\theta$ and ${\alpha }_0$. We also investigate the decoherence of the MCSO-OSCS in terms of the fadeaway of the negativity of WF in a thermal environment.

14 pages with 10 figures

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