الفهرس 
صفحة العنوانOnly 14 pages are availabe for public view
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Abstract
In this thesis, we study the interaction between a two-level atom and a time- dependent cavity field in different cases for the atom which initially may be pre¬pared in the excited state or the superposition of states. The field may be initially prepared in coherent state. We also, study the interaction between the k-mode field and a two two-level atoms. We study the effect of Stark shift contributions and the effect of damping of both atom and field. The field passes through a Kerr medium which changes the propagation properties of the field. We investigate some physical statistical properties of the system such as atomic inversion, Pancharatnam phase and the second order correlation function to study bunching and anti bunching ef¬fects. We also investigate entropy squesing, Von Neumann entropy and concurrence to study the degree of entanglement. Husimi Q-function is studied to give a classical representation of the system state.