The quantum statistical properties of the superposition state involving a coherent state and a squeezed vacuum are investigated. Such states can enhance the squeezing parameter and the intensity compared with the incoming squeezed vacuum state. Also, the antibunching effect can occur in such states under certain conditions.
We mainly examine the nonclassical statistical properties of both squeezed even and Squeezed odd coherent states defined by the superposed states involving two squeezed coherent states with a phase difference n between their displacement parameters. We demonstrate that the fields in squeezed even coherent state can exhibit remarkably enhanced squeezing level and mean photon number in comparison with the input squeezed coherent state. We also point out the examples of the physical processes leading to such a superpotition.
We examine the nonclassical statistical properties of the squeezed even and the squeezed odd coherent states defined by the superposed states involving two squeezed coherent states with phase difference π between their displacement parameters. We demonstrate that the fields in the squeezed even coherent state can exhibit a remarkably enhanced squeezing level and mean photon number in comparison with the input squeezed coherent state. We also give examples of physical processes that lead to such a superposition.
With a squeezing operation on the qubit state,we obtain a coherent superposition state of a squeezed vacuum state and a squeezed single photon state with certain weight rate.The coherent superposition state depends on the squeezing parameter and weight factor,I and its nonclassicality and non-Gaussian properties are researched.It is investigated by the sub-Poissonian statistics distribution of Mandel′s Q parameter and the negativity of the Wigner function.The non-Gaussianity of coherent superposition qubit state can be improved by adjusting the squeezing parameter and the weight factor.