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Journal of Shaoguan University

Squeezing of the Radiation Field in the Interaction of a Cascade Three-level Atoms and Strong Coherent Field of Initial State

Ying Chen

Published Jan 1, 2001• 0 citations
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Abstract

The squeeing properties of the radiation field in the interaction of a cascade three level atoms and strong coherent field of initial state are studied by numerical calculation . The results show that the radiation field is mainly in non squeezed states,and the short time squeeing effects of the radiation field only appear in the initial time and in several initial trough;with the increasing of the value of ,the maximum of squeezing of radiation field changes periodically.

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Quantum Properties of the Binomial Field Interacting with a Cascade Threelevel Atom Beyond the Rotating Wave Approximation

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The squeezing effect and atomic population of the binomial field interacting with a cascade three level atom are calculated accurately without rotating-wave approximation(without RWA) by using the complete quantum theory.The influences of the binomial state field parameter η on the field squeezing effect and the maximum photon number M of the binomial state field on the atomic population are considered.The results obtained from using the numerical method show that with increase of the binomial state field parameter η,the duration of the squeezing effect increases at first and then decreases.The little indentation oscillation appears in the evolution curves of the field squeezing effect,which is caused by virtual photon without RWA.The period of the revival-collapse increases with the increase of the maximum photon number M,and the atomic population can not collapse completely in the collapse regime,but displays little indentation oscillation.In addition the influence of the without-RWA terms on the quantum properties of the system are discussed.

ACTA PHOTONICA SINICA•Jan 1, 2012•0 citations
The squeeing properties of the radiation field in the interaction of a cascade three level atoms and strong coherent field of initial state are studied by numerical calculation . The results show that the radiation field is mainly in non squeezed states,and the short time squeeing effects of the radiation field only appear in the initial time and in several initial trough;with the increasing of the value of ,the maximum of squeezing of radiation field changes periodically.
Antibunching effect and squeezing property of the binomial state field interact- ing with a cascade three-level atom are studied by using quantum theory and calculation method,and the influences of initial field parameters on the quantum properties of the field are discussed.The results are that,firstly,when the field is initially in a coherent state,its antibunching effect can be displayed discontinuously and squeezing effect can be exhibited in a short time;Secondly,when the initial field is in a middle state between the coherent state and number state,the field shows antibunching effect continuously and the deep degree and sustained time of its squeezing effect increase;Finally,while when the initial field transmits to a fock state,the field reveals continuously antibunching effect but its squeezing effect weak- ens to disappear.Our results show that binomial state field displays remarkable no-classical properties when it interacts with a cascade three-level atom.
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.
Entropy squeezing effect of the binomial state field interacting with a cascade three-level at- om are studied by using quantum entropy theory effect and calculation method,and the influences of initial field parameters on the entropy squeezing effect of the field are discussed.The results are that, firstly,when the field is initially in a coherent state,entropy squeezing effect can be exhibited in a short time;secondly,when the initial field is in a middle state between the coherent state and number state,the depth and sustained time of the field's squeezing effect increase;finally,when the initial field transmit to a lock state,the field's squeezing effect weakens and disappears in the end.The re- sults show that binomial state field displays obviously entropy squeezing effect when it interacts with a cascade three-level atom.
This paper studied the atomic dipole amplitude squared squeezing in the system of a three level atom interacting with a single mode radiation vacuum field. Numerical method is adopted to discuss the influence of the relative value of atom field coupling constants and the atomic initial coherence on the squeezing effect. It is found that no squeezing is produced in the process of interaction if the atom is initially most excited or in its ground state. However, if the atom is initially in a coherent superposition state of the ground state and the most excited state, there will be dipole amplitude squared squeezing effect in the process of interaction; the squeezing degree depends on the phase factor relating to atomic initial coherence; when other conditions are fixed, the atom will produced optimum squeezing effect if the probability of atom initially in the most excited state is 1/4 and the probability of it initially in the ground state is 3/4. If none of the atom field coupling constants are zero, the quantities of squeezing vary periodically; the change period of the quantities of squeezing depends on the relative value of two atom field coupling constants.
The squeezing effect and atomic population of the binomial field interacting with a cascade three level atom are calculated accurately without rotating-wave approximation(without RWA) by using the complete quantum theory.The influences of the binomial state field parameter η on the field squeezing effect and the maximum photon number M of the binomial state field on the atomic population are considered.The results obtained from using the numerical method show that with increase of the binomial state field parameter η,the duration of the squeezing effect increases at first and then decreases.The little indentation oscillation appears in the evolution curves of the field squeezing effect,which is caused by virtual photon without RWA.The period of the revival-collapse increases with the increase of the maximum photon number M,and the atomic population can not collapse completely in the collapse regime,but displays little indentation oscillation.In addition the influence of the without-RWA terms on the quantum properties of the system are discussed.