Two mode mechanical non-Gaussian squeezed number state in a two-membrane optomechanical system

We consider an optomechanical system with two membranes when a bichromatic laser field with redsideband and blue-sideband frequencies is applied in the single photon strong coupling regime. It is shown that using the mode selecting method and under the Lamb-Dicke approximation, motion of membranes can evolve to single or two mode squeezed number states. By considering the environmental effect, a Wigner function is plotted for understanding the conditions that lead to the generation of non Gaussian states. The results show that, in this system, initial states of membranes are important to generation of non-Gaussian mechanical squeezed number states. (C) 2016 Elsevier B.V. All rights reserved.