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Acta Physica Sinica

STUDY OF DYNAMICAL SYMMETRY BETWEEN THE FIELD AND ATOMIC DIPOLE SQUEEZING IN A TWO-LEVEL SYSTEM

Rui-hua Xie, 南京大学物理系

Published Jan 1, 1996• 0 citations
Publisher

Abstract

The symmetry between the field and atomic dipole squeezing(SFAS)has been exposed in the resonant JCM. The influence of some nonlinear interactions,including the nonresonant interaction, the virtual-photon processes,the intensity-dependent coupling and the interaction of a Kerr-like medium with the cavity on the SFAS has been discussed . At(2m+1)-quantum resonance,the relationship between the field and atomic squeezing has been examined.

DOI
10.7498/aps.45.1463

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The symmetry between the field and atomic dipole squeezing(SFAS)has been exposed in the resonant JCM. The influence of some nonlinear interactions,including the nonresonant interaction, the virtual-photon processes,the intensity-dependent coupling and the interaction of a Kerr-like medium with the cavity on the SFAS has been discussed . At(2m+1)-quantum resonance,the relationship between the field and atomic squeezing has been examined.
We have studied the squeezing properties of a field and atom in a two-level system. The influence of nonlinear interactions (Le. the arbitrary intensity-dependent coupling of a single-mode field to a single two-level atom, the nonlinear interaction of the field with a nonlinear Kerr-like medium) on the squeezing is discussed in detail in the rotating wave approximation (RWA). We show numerically that the effect of the virtual-photon field suppresses dipole squeezing predicted in the RWA and leads to an increased squeeze revival period; the suppressed squeezing can be revived due to the presence of the nonlinear Kerr-like medium.
By means or investigating the time evolution of the atomic dipole squeezing and the field squeezing in the one-photon Jaynes-Cummings model and the nondege-nerate two-photon Jaynes-Cummings model, the relations between atomic dipole squeezing and squeezing in the radiating field are examined. The conditions under which the atom in atomic dipole squeezed state can radiate squeezed light are presented. The properties of the squeezing transformation between atomic dipole quadrature components and field quadrature components are also discussed. And in the atom-field coupling system, the two-photon transtion processes in producing squeezed light are superior to the one-photon transition processes.
In this paper,the atomic dipole squeezing in the non-resonance system of single-model squeezed vacuum field interacting with two coupling atoms via intensity-dependent coupling in Kerr medium are investigated.By using the numerical method,the relations between the atomic dipole squeezing and the coupling parameter of the system are discussed.The results show that the atomic dipole squeezing depend on the Kerr effect,the detuning,the dipole-dipole interaction between atoms,the initial squeezed parameter of the light and the atomic initial state.
The atomic dipole squeezing effect in the system of two identical two-level atoms in the Bell state interacting with the two-mode entangled coherent state field in Kerr medium are investigated by means of solving the Schrdinger equation and numerical calculations. The effects on the atomic dipole squeezing effect produced by the atomic initial state, mean photon number of light field, the degree of the entanglement of the entangled coherent field, the coupling strength of the Kerr medium with the light field and the coupling strength of dipole-dipole interaction between atoms are discussed. The results show that the dipole squeezing effect does not appear for the Bell state |β11>, while there can be dipole squeezing effect under certain conditions for the Bell states |β00> or |β01> or |β10>. In the latter case, the dipole squeezing effect depends on the coupling strength of the Kerr medium with the light field, the mean photon number and the degree of entanglement of the two-mode entangled coherent field.