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Journal of Hebei Normal University

Field Entropy Evolution of Entangled Atoms Interacting with Coherent State Light-field in T-C Model

Duo Zhang

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

The field entropy evolution of two entangled-atoms interacting with coherent state light-filed is studied by means of quantum theory.The influence of the dipole-dipole interaction,the intensity of field and the two-atom's entanglement on the field entropy properties are studied.The results show that the increasing of the atomic dipole-dipole interaction will increase evolution period of field entropy.The mean-value of entropy will increase at first and then decrease with the intensity of field increasing.The oscillation period of field entropy increases with the increase of the intensity of field.The mean-value of field entropy will decrease with the increasing of atoms' entanglement,but the oscillation of field entropy will increase with the increasing of the entanglement of atoms.

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According to the complete quantum theory,the quantum field-entropy evolution properties in a system of the two coupled two-level atoms interacting with a single-mode odd-coherent state light field are studied.Through numerical calculation the influence of the initial mean photon number n_0,the coupled intensity g of interaction between the single-mode field and atoms,and the coupled intensity g_a of dipole-dipole interaction between the two coupled atoms on the quantum field-entropy evolving while the initial state of the light field is a single-mode odd-coherent and the two coupled two-level atoms lay in different Einstein Poclolsky Rosen(EPR) entangled state respectively.The results indicate that the time evolving of quantum field-entropy is closely related to the initial atoms state.The quantum field-entropy evolution can display the phenomena of entanglement and disentanglement while they are periodically under the condition of intensity field(n_01). Meanwhile the phenomena of quantum interference is also discovered.The periodicity of the quantum field-entropy anomalous oscillation decreases gradually with the increasing of g values.When g_a is an especial constant,it is shown that the phenomena of period collapse-reversion can present.
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The field entropy evolution of a system which is composed of two moving entangled atoms interacting with the Schrdinger cat state is studied by means of the full quantum theory.The influences of the strength of light field,the phase angle between the two coherent states,the atomic motion and the field-model structure parameter on the field entropy are discussed.The result shows that the atomic motion leads to the periodic evolution of the field entropy.When the strength of light field is small,the degree of entanglement is maximum in a system of the moving atoms interacting with an odd coherent state;it is intermediate for a system of the the moving atoms interacting with Yurke-Stoler coherent state,and it is minimum in a system of the moving atoms interacting with an even coherent state.When the strength of light field is large enough,the degrees of entanglement between the moving atoms and the three different states of the light fields become equal,and the properties of field entropy evolvement are also same.With increasing atomic speed or field-model structure parameter,the evolution period of the field entropy is shortter,the degree of entanglement between field and moving atoms is weaker.