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Acta Sinica Quantum Optica

Squeezing Effect of the Field Interacting with a Moving Atom

Xiang-Ping Liao

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

The squeezing effect of the field intera cting with a moving atom is investigated by means of the evolution operator in quantum optics. The influence of the initial average photon number and field model structure parameter on the squeezing property of the field is studied. It is shown that the field may exhibit long time squeezing effect by chosing system parameters appropriately.

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Chinese Physics•May 3, 2005•3 citations
The squeezing effect of the field intera cting with a moving atom is investigated by means of the evolution operator in quantum optics. The influence of the initial average photon number and field model structure parameter on the squeezing property of the field is studied. It is shown that the field may exhibit long time squeezing effect by chosing system parameters appropriately.
The information entropy squeezing properties of the atom in motion interacting with the binomial states field via single photon transition are studied by means of quantum theory.The influences of the parameter of light 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,amplitude,squeezed time and squeezed direction of the atomic information entropy can be controlled by choosing the atomic initial state,the field structure parameter,the velocity of atomic motion.It is shown that the moving atom may exhibit the long time squeezing effect for some parameters.
The influence of the motion of atomic mass centre, field mode structure and initial mean photon number on the field entropy squeezing is investigated by means of the theory of quantum information entropy. It is shown that the motion of atomic mass center leads to the periodic evolution of the field entropy squeezing and this period depends on the field mode structure parameter; an increase in field-mode structure parameter results in not only shortening of the evolution period of the field entropy squeezing but also prolonging of the squeezing time; the field may exhibit long time entropy squeezing effect for some choieed system parameters.
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.
The radiation squeezing effect in the interaction process between the single mode squeezed vacuum field and a moving two-level atom is studied by means of solving the Schrdinger equation and numerical calculations.The results are as follows: with the increasing of the atom's speed and the parameter of field model structure,the time evolution curve rises noticeably;with the rising of the probability breadth of the atom ground state,the squeezing depth of the radiation field increases,otherwise it decreases,even there is no squeeze;the phase angle effects the time evolution curve's change like the probability breadth of the atom ground state;during the process that the compression factor becomes larger,the radiation field can not squeeze firstly,then it squeezes partially,finally the squeeze gradually disappears.
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.