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Neimenggu Shi-da xuebao. Zhexue shehui kexue hanwen ban

Atomic Inversion in a System of a Moving Two-Level Atom for MultiPhoton Transition Interacting with the Number-Chaotic State Light

Yana Wang

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

The atomic inversion evolution in a system which is composed of a multi-photon transition moving two-level atom interacting with the number-chaotic state is studied by means of the full quantum theory.The influences of the atomic initial state,field-mode structure parameter,the average photon number of the chaotic state,the photon number of the number state and the values of the transitional photon number are also analysed in this paper.The results show that the atomic motion will make the particle distribution inversion appear different periodic oscillation rules.The particle distribution inversion presents different patterns because of the parity of transition photon number.

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Neimenggu Shi-da xuebao. Zhexue shehui kexue hanwen ban•Jan 1, 2012•0 citations
The atomic inversion evolution in a system which is composed of a multi-photon transition moving two-level atom interacting with the number-chaotic state is studied by means of the full quantum theory.The influences of the atomic initial state,field-mode structure parameter,the average photon number of the chaotic state,the photon number of the number state and the values of the transitional photon number are also analysed in this paper.The results show that the atomic motion will make the particle distribution inversion appear different periodic oscillation rules.The particle distribution inversion presents different patterns because of the parity of transition photon number.
When single mode coherent light field interacts with two-level atomic mixed-state,the properties of the atomic population inversion is studied by means of the multi-photon anti-Jaynes-Cummings model.The influence for the parameters of average photon number of the coherent light field,transition photon number and mixing extent of the atomic initial state on the atomic population inversion has been discussed.The results show that the collapse and revival phenomena of periodicity will also appear in the two-level atomic population inversion.With the increasing of the average photon number of the coherent light field and the transition photon number,the revival period and attenuation time of collapse will change.With the increase of the average photon number of the coherent light field,the oscillation frequency of the atomic population inversion increases correspondingly.The revival period and attenuation time of collapse will not change,but the oscillation amplitude of the atomic population inversion will be increase as the decreasing of mixing extent of the atomic initial state.
The entropy evolution properties of field (atom) in a moving cascade three-level atom interacting with a single-mode field are studied through two photon transitions. When the atom is initially in coherent state, the influences of the atomic motion, the field-mode structure parameter and the initial average photon number on the evolution of the entropy are discussed. The results show that the entropy evolution period of the field is dependent of the atomic motion and the field-mode structure parameter. However, the parameter of the initial average photon number will neither lengthen nor shorten the entropy evolution period of the field, but the numerical values of maximum and sub-minimum of entropy will be affected by it.
By means of the quantum theory,the population inversion of two atoms in the system of two two-level atoms coupled to a light field in the Binomial Optical Field are investigated in the presence of phase decoherence in the multiphoton Tavis -Cumming Model.The influences of the phase decoherence coefficient,the parameters η of the binomial optical field,the maximum number of photons and the number of the transitional photons on the properties of the population inversion of two atoms have been discussed. The results show that the phase decoherence reduced the oscillation amplitude of the population inversion of two atoms and destroyed the atomic quantum characteristic.Changing the number of the transitional photons,evolved cycle and evolved intensity the population inversion of two atoms can be changed.The phenomena of collapse and revival disappear as photon number increase.When the binomial optical state changes from a coherent state to a Fock state,the oscillation frequency of the atomic population reduces gradually,the phenomena of collapse and revival vanishes gradually.
In order to find out the effect of atomic motion on the population inversion of two atoms,the atomic states were analyzed by the method of quantum mechanics.It was found that the population inversion of two atoms was related to the field mode structure in an optical resonant cavity when the atoms were moving and the optical field was in coherent state.When two atoms in the cavity were fixed at initial time,the evolvement of population inversion of two atoms was periodic in the case of a small average photo number,and there were collapses and revivals of atomic inversion in the case of a large average photo number.The evolvement of population inversion of two atoms became well-regulated orderly under the coherent cavity field when atoms were in motion at initial time.The population inversion of two atoms will evolve in different periods when the two atoms move in axial direction at different velocity.The period of population inversion is the lease common multiple of periods of coupling coefficients between two atoms and field.When there are more average photon number in the cavity,the oscillation of population inversion will be faster.So it is possible to control the population inversion by properly choosing the velocity of atoms and the initial field.
Considering a moving two-level atom interacting with a single-mode thermal field through multi-photon process, in this paper we study the entropy exchange between the atom and the field by using quantum partial entropy and entanglement measured by using Concurrence, and investigate the effects of the initial atomic state, the atomic motion, the mean photon number and the transition photon number on entropy and entanglement. The results show that the entropy exchange and the entanglement exhibit the periodic evolution due to atomic motion, and entropy exchange occurs. The entanglement between the atom and the field is strengthened as the transition photon number increases. When the partial entropy exchange between atom and field is zero, the entanglement is also zero.
The quantum properties of atoms in Gaussian coupling Tavis-Cummings model in the multi-photon transition process are studied.The influence on atomic population inversion and double-atom dipole squeezing from atomic motion,the mean photon number in initial states of the light field,number of transition photons in the multi-photon transition process are discussed with the numerical calculation method.The results show that the variation of atomic motion changes the time for effective action between atomic population inversion,double-atom dipole squeezing and fight field.The variation of number of transition photons changes oscillation amplitude and frequency of time evolution of atomic population inversion and double-atom dipole squeezing.