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Journal of Hengyang Normal University

Coherence Property of a Pair of Two-level Atoms by Dipole-dipole Interaction

Deng-Yu Zhang

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

A pair of two-level atoms by dipole-dipole interaction being put in a theremal radiation field is studied. The non-opposite angle element of atoms' reducible density rectangular arrary through an external controllable driving field is obtained. Coherence property of two-level atoms is analyzed.

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ACTA PHOTONICA SINICA•Jan 1, 2008•0 citations
The coherence of two-level atom in a thermal radiation field without rotating wave approximation through an external controllable driving field was investigated. The time evolution properties of non-opposite angle element of two-level atom's reducible density rectangular array was discussed. Coherence properties of two-level atom was studied in degenerate two-photon processes when the two-level atom interacts with an driving field in the thermal radiation field . We obtained the properties of an external driving field when two-level atom's coherence is maintained.
The time evolution properties of non opposite angle element of two level atoms reducible density rectangular array was discussed.Coherence properties of two level atom was studied in one photon processes when the two level atom interacts with an driving field in the thermal radiation field.When two level atoms coherence is maintained,the theoretical result demonstrates that time evolution of an external driving field is closely related to atomic jump frequency,atomic motion velocity and the average of k modul photon number etc.
A model is built when the two two-level atoms is in thermal radiation field environment.By means of the density rectangular method,two two-level atoms'reducible density rectangular array is obtained when atoms by dipole-dipole interaction are put in a thermal reservoir.The problem of fidelity of two-level atoms is studied which are put in the strongly thermal radiation field.It is shown that the two two-level atoms initially situated in different coherent superposition states,quantum information may lose fidelities partly or may not lose fidelities during evolution in transmit process.The initial states may influence the losing fidelities speed obviously.