Nonclassical and non-Gaussian properties of states generated by the superposed photon added-and-subtracted operation on squeezed vacuum

A new kind of non-Gaussian quantum state is constructed by operating the superposed operator (SO) (cos theta aa(dagger) + sin theta a(dagger)a) on a squeezed vacuum state (SVS) S(r)0 >. It is found that the SOSVS is just a superposition state between S(r)vertical bar 0 > and S(r)vertical bar 2 > with only even numbers of photons. The nonclassicality is investigated by exploring the negativity of Wigner function (WF) and the sub-Poissonian distribution of Mandel's Q-parameter. The non-Guassianity is exhibited via the fidelity between the SOS VS and the SVS and the marginal distribution of its Wigner function. It is found that such SO on the SVS can enhance the nonclassicality and change the non-Gaussianity of the SOSVS. This provides the possibility of generating quantum states with specific nonclassical and non-Gaussian properties. (C) 2014 Elsevier GmbH. All rights reserved.