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Physics Letters A

Interaction of a two-level atom with an even coherent state

Christopher C. Gerry, Edwin E. Hach

Published Jul 1, 1993• 28 citations
Publisher
DOI
10.1016/0375-9601(93)91081-f

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Journal of Atomic and Molecular Physics•Jan 1, 2009•0 citations
Collapses and revivals phenomenon in system of a single two-level atom and two two-level atoms existing in some superposed states and interacting with a single mode superposed coherent radiation is studied. For superposed Dicke states |1/2, ±1/2> of a single two-level atom interacting with even or odd coherent state, only odd revivals occur. For two two-level atoms, it is found that the collapse and revival times for even and odd coherent states are equal to one half of the corresponding times for coherent state. For this system, Rabi oscillations occur with a main mean frequency and also some second harmonics are present, in general. However, if the two atoms are in the superradiant state, only the second harmonics with large amplitude are obtained. The appearance of weak double frequency revivals for superposed atomic and coherent states was studied and a condition for their disappearance is found.
Base on the dispersive atom-cavity field interaction,the scheme for preparing the entangled coherent state is discussed.An experimentally feasible protocol for realizing entanglement diversion of the entangled coherent states by using a two-level atom interacting with caving fields is proposed.In this scheme,the entanglement between two coherent states,|α〉and|-α〉,with the same amplitude but a phase differenceπis utilized as the quantum channel.The process of the entanglement diversion is implemented by using the two-level atom interacting with caving fields,two-modes orthogonal states measurement and with the help of classical information.With the present development of cavity quantum electrodynamics (QED) techniques,the scheme can be achieved.