Effects of cavity-field statistics on atomic entanglement in the   Jaynes-Cummings model
  We study the entanglement properties of a pair of two-level atoms going through a cavity one after another. The initial joint state of two successive atoms that enter the cavity is unentangled. Interactions mediated by the cavity photon field result in the final two-atom state being of a mixed entangled type. We consider the field statistics of the Fock state field, and the thermal field, respectively, inside the cavity. The entanglement of formation of the joint two-atom state is calculated for both these cases as a function of the Rabi-angle $gt$. We present a comparitive study of two-atom entanglement for low and high mean photon number cases corresponding to the different fields statistics. 
Biplab Ghosh, A. S. Majumdar, N. Nayak