When Non-Gaussian States are Gaussian: Generalization of   Non-Separability Criterion for Continuous Variables
  We present a class of non-Gaussian two-mode continuous variable states for which the separability criterion for Gaussian states can be employed to detect whether they are separable or not. These states reduce to the two-mode Gaussian states as a special case. 
Derek McHugh, Vladim\'ir Bu\v{z}ek and M\'ario Ziman