Eur. Phys. J. D (2012) 66: 166
https://doi.org/10.1140/epjd/e2012-30125-2

Regular Article

Nonclassical properties of multiple-photon subtracted displaced squeezed thermal states

¹ Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
² College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, P.R. China

^a e-mail: wangshuai197903@sohu.com

Received: 21 February 2012
Received in final form: 9 April 2012
Published online: 29 June 2012

Abstract

We investigate how the combination of photon subtraction and coherent displacement affects the nonclassical properties of multiple-photon subtracted displaced squeezed thermal state (PSDSTS). We find that the Mandel Q parameter, the quadrature squeezing and the negative volume of Wigner functions of the PSDSTS are all periodic functions of the compound phase φ − θ/2 involved in the squeezing parameter ξ = re^iθ and the displacement parameter λ = |λ|e^iφ with a period π. Particularly, we find that some interesting effects arise as φ − θ/2 = π/2. However, they are all phase independent except the Wigner function when λ = 0. Finally, we investigate the non-Gaussianity of the PSDSTS according to the fidelity between the PSDSTS and the displaced squeezed thermal state (DSTS), and find that the non-Gaussianity induced by the photon-subtraction operation is essentially nonclassical.