Spontaneously induced atom-radiation entanglement in an ensemble of two-level atoms

Analysis of the spontaneously induced correlation on atom-radiation entanglement in an ensemble of two-level atoms initially prepared in the upper level and placed in a cavity containing a squeezed radiation employing the method of evaluating the coherent-state propagator is presented. It is found that the cavity radiation exhibits squeezing which is directly attributed to the squeezed radiation in the cavity. The intensity of the cavity radiation increases with the squeeze parameter and interaction time. It is also shown that substantial degree of entanglement between the atomic states and radiation mode exits at a particular time that depends on the coupling constant and squeeze parameter. We come to understand that though the squeezed radiation is directly accountable for the cavity squeezing, it significantly destroys the atom-radiation entanglement.