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Journal of Kashgar Teachers College

Amplitude Coherent States for Radiation Field Interacts with Two Level Atom and Evolution of Field Entropy

Jianwei Wang

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

Interacting of two level atom with amplitude coherent states have been studied by use of the Jayness-Cummings model,transition probability between every two levels of the system for atom and photon-field is also studied. At the same time, evolution of the field entropy is discussed.

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We investigate some of the fundamental features of the interaction of squeezed light with two-level atoms in the framework of the Jaynes-Cummings model. We start our analysis by calculating the collapses and revivals of the atomic inversion. We discuss the degree of purity of the field (given by the entropy) and its disentanglement from the atomic source. The connection with the evolution of the Q-function is also made. We notice that contrary to the coherent state case, the field turns into a nearly pure (squeezed) state at the revival time as if the field was prepared in a coherent state. The field also becomes a superposition of squeezed states at half of the revival time, and this is confirmed by investigating the photon number distribution. The phase properties of the field are discussed using the Pegg-Barnett formalism.