Generation of Entangled Two-Photons Binomial States in Two Spatially   Separate Cavities
  We propose a conditional scheme to generate entangled two-photons generalized binomial states inside two separate single-mode high-Q cavities. This scheme requires that the two cavities are initially prepared in entangled one-photon generalized binomial states and exploits the passage of two appropriately prepared two-level atoms one in each cavity. The measurement of the ground state of both atoms is finally required when they exit the cavities. We also give a brief evaluation of the experimental feasibility of the scheme. 
R. Lo Franco, G. Compagno, A. Messina, and A. Napoli