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Annual Meeting Optical Society of America

Photon dynamics of an N-level atomic system interacting with a radiation field in the thermocoherent state

Minos A. Neto, José Antonio Roversi, M. P. Sharma

Published Jan 1, 1992• 0 citations
Publisher

Abstract

Photon dynamics of a radiation field, prepared in the thermocoherent state and interacting with an N-level atomic system, are studied theoretically. It is observed that the phenomenon of collapse and revival has strong dependence on the number of levels the atom has. It is also observed that the collapse and revival phenomenon is very sensitive to the initial number of photons present in the system, to the coupling constants, and to the detuning.

DOI
10.1364/oam.1992.tuz52

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Photon dynamics of a radiation field, prepared in the thermocoherent state and interacting with an N-level atomic system, are studied theoretically. It is observed that the phenomenon of collapse and revival has strong dependence on the number of levels the atom has. It is also observed that the collapse and revival phenomenon is very sensitive to the initial number of photons present in the system, to the coupling constants, and to the detuning.
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In this essay we introduce a new Hamiltonian which represents the interaction between a three-level atom and a single electromagnetic field including arbitrary forms of nonlinearities of both the field and the intensity-dependent coupling. We derive an exact solution for the density operator of the system by means of which we study the field purity for the entangled state of the system. Also, the influences of the nonlinearities on the field purity and mean photon number are examined. Under the condition of an initial coherent field, the field purity shows the collapse-revival phenomenon. It is found that features of these phenomenon are sensitive to the changes of different kinds of the nonlinearities.