Quantitative measures of entanglement in pair coherent states
  The pair coherent states for a two-mode radiation field are known to belong to a family of states with non-Gaussian wave function. The nature of quantum entanglement between the two modes and some features of non-classicality are studied for such states. The existing criteria for inseparability are examined in the context of pair coherent states. 
G. S. Agarwal and Asoka Biswas