Evolution of the superposition of displaced number states with the   two-atom multiphoton Jaynes-Cummings model: interference and entanglement
  In this paper we study the evolution of the two two-level atoms interacting with a single-mode quantized radiation field, namely, two-atom multiphoton Jaynes-Cummings model when the radiation field and atoms are initially prepared in the superpostion of displaced number states and excited atomic states, respectively. For this system we investigate the atomic inversion, Wigner function, phase distribution and entanglement. 
Faisal Aly Aly El-Orany