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Chinese Physics

Influence of atomic motion on squeezing of double-mode field in interaction with a moving V-type three-level atom

Ai‐Dong Zhu, Zhang Shou, Yongfang Zhao

Published May 3, 2005• 3 citations
Publisher

Abstract

The influence of atomic motion on squeezing of the double-mode field in the interaction with a moving V-type three level atom is investigated by means of the quantum theory and the method of numerical analysis. The results show, on the one hand, when the initial photon field is in non-correlative coherent state of double-mode, only the quadrature U 1 is squeezed and the squeezed degree of U 1 increases with the increasing of the parameter β which describes the atomic motion and structure of the field mode. On the other hand, when the initial field is in the vacuum squeezed state of double-mode, the quadrature U 2 is squeezed principally and we can obtain a steady squeezed light by choosing an appropriate parameter β.

DOI
10.1088/1009-1963/14/6/017

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The influence of atomic motion on squeezing of the double-mode field in the interaction with a moving V-type three level atom is investigated by means of the quantum theory and the method of numerical analysis. The results show, on the one hand, when the initial photon field is in non-correlative coherent state of double-mode, only the quadrature U 1 is squeezed and the squeezed degree of U 1 increases with the increasing of the parameter β which describes the atomic motion and structure of the field mode. On the other hand, when the initial field is in the vacuum squeezed state of double-mode, the quadrature U 2 is squeezed principally and we can obtain a steady squeezed light by choosing an appropriate parameter β.
two-mode squeezed vacuum field interacting with a V-type three-level moving atom is investigated. We can get analytic expressions of second-order correlation function and two-mode correlation function. The influence of atomic motion, the field structure and intensity of photons on second-order correlation function and two-mode correlation function are obtained by numerical calculation. The results indicate that correlation function and photon bunching increase obviously when intensity of photons increase; photon bunching and antibunching don't change when atomic motion and the field structure increase, but the period of photon bunching and antibunching reduce greatly.
The information entropy squeezing properties of the atom in motion interacting with the two-mode squeezing vacuum field via two-photon transition are studied by means of quantum theory.The influences of the velocity of atomic motion,the field structure and the parameter of squeezing field on the information entropy squeezing properties of the atom are investigated as the initial atom is in any state.The results indicate that the value of squeezed component of the atomic dipole,squeezed frequency,amplitude and squeezed direction of the atomic information entropy can be controlled by choosing the atomic initial state,the velocity of atomic motion,the field structure and the squeezing factor of field and the squeezing phase angle of the field,respectively.In the longer time,squeezing effects of the atom in motion can be obtained by choosing the system parameters.The mixing degree of atomic initial state has no influence on the entropy squeezing of the atom in motion.
By means of solving the Schrodinger equation and numerical calculation,the radiation squeezing effects in the system of the coherent states field interacting with a moving-type three-level atom has been discussed.The numerical result indicates that,in the system of the coherent states field interacting with a moving-type three-level atom radiation field,mean photon number,the speed of motion atom and the field mold structure would have the certain degree of influence on the radiation squeeze.When fixed the speed of moving atom and the field mold structure,through increases the mean photon number may realize completely complete squeezing effects.Along with increment of mean photon number,there is no change in the oscillation period of the squeezing curve,but its scope increases obviously and its stability begins to reduce;when the mean photon number and the field mold structure fixed,the speed of moving atom has a great infection on the extent and period of the radiation squeeze.With the speed of moving atom increasing,not only the complete squeezing effect would be archived,the stability would also enhance.
By means of solving Schrdinger equation and numerical calculations,the dynamic behavior of the interaction between the single mode squeezed vacuum field and a moving Ξtype three-level atom has been studied,and the relations between the radiation squeezing effects and the coupling parameter of the system are discussed.The results of numerical calculations indicate that,the squeezed property of the radiation field is determined by the speed of the atom,and the squeezed property of the radiation field can be obviously influenced by the squeezing parameter of the system when the Ξ-type three-level atom moves with great speed.the radiation field can show complete squeezing effects when the system parameters are selected appropriately.
The influences of detuning δ and initial squeezed light_field factor r on the light squeezing and Cauchy_Schwartz inequality in the system of two_mode squeezing vacuum field interacting non_resonantly with a Λ_type three_level atom is investigated.The results show that the light field is squeezed regularly. The light squeezing level is evidently relative to r and δ. With the increase r, the nonclassical correlation properties between the two mode cavities get steady. The detuning makes the nonclassical correlation degree steady.
The entropy squeezing properties of different types of moving three-level atoms coupled with a single-mode coherent field are studied. The influences of the moving velocity and initial states of the three-level atom on the entropy squeezing are discussed. The results show that, the entropy squeezing properties of the three-level atom depend on its initial state, moving velocity, and the type. A stationary three-level atom can not obtain a steady entropy squeezing whatever initial conditions are chosen, while a moving three-level atom can achieve a steady and optimal entropy squeezing through choosing higher velocity and appropriate initial state. Our result provides a simple method for preparing squeezing resources with ultra-low quantum noise of the three-level atomic system without additional any complex techniques.