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Journal of Anqing Teachers College

Atomic Squeezing of the Time-varying-frequency Light-field Interacting with Two-level Atom

WU Wei-fen

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

In the rotating-wave approximation,the atomic operator squeezing effect in the system that consists of a two-level atom interacting with time-varying-frequency field is studied. Considering the field frequency varying with the time in the form of sine-function at the same time,by means of the quantum theory and numerical calculation,the curve varying with time is derived. The results show that atomic squeezing is affected by time-varying-frequency light-field.

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Acta Physica Sinica•Jan 1, 2006•11 citations
In the rotating-wave approximation,the atomic operator squeezing effect in the system that consists of a two-level atom interacting with time-varying-frequency field is studied. Considering the field frequency varying with the time in the form of sine-function at the same time,by means of the quantum theory and numerical calculation,the curve varying with time is derived. The results show that atomic squeezing is affected by time-varying-frequency light-field.
Using the multiphoton Jaynes-Cummings model,the squeezing effect of the field in the system of a two-level atom interacting with the single mode coherent field through mutiphoton transition was studied.The frequency of the field varying with time in the form of sine was considered.The influences of amplitude and angular frequency of the field-frequency variation on squeezing effects of the field were discussed by numerical calculations.The influences of mean photon number of the field on squeezing effects of the field were also discussed.Calculation results indicate that the squeezing effects of field strengthens with the increase of the amplitude u of field-frequency variation and weaken with the increase of mean photon number of the field.The time-evolution behavior of quadrature squeezing function Q1 is modulated by the field-frequency variation.The modulation intensity is enchanced with the increase of the amplitude u of field-frequency variation,and when the amplitude u of field-frequency variation is larger than a fixed value,the time-evolution of quadrature squeezing function Q1 will display quasi-periodicity oscillation behavior.Its oscillation frequency agrees with the angular frequency of field-frequency variation.
The interactions between a two-level atom and a squeezed field of time-varying frequency have been investigated. The properties of the atomic population inversion for two typical cases——the frequency of the field varying with time in the forms of sine function and rectangular pulses——have been considered. For the frequency changing with time in sinusoidal form, the collapse-revival phenomenon of the atomic population inversion is deformed not only by the frequency-modulation but also by the squeeze coefficient and the squeeze phase of the field. The sudden jumping of the field with rectangular pulsed frequency-modulation can lead to new collapses and revivals in the evolution of the atomic population inversion. The rectangular pulsed frequency-modulation can also lead to small-amplitude fast oscillations of the atomic population inversion during the pulse. There is no relation between the latter phenomena and the squeeze coefficient of the field.
The two-photon transition for a two-level atom interacting with a single-mold electromagnetic field has been investigated. The initial coherent states with time-varying frequency are considered. The effects of the frequency modulation in sinusoidal form on the atomic population inversion and the squeezing properties of the atom and field are studied. The frequency change can lead the collapse-revival period of population inversion to increase, the maximum value of the revival to decrease, and the squeezing effects of the field and atom are weakened.
The interactions between a two-level atom and a coherent field with a time-varying frequency without rotating-wave approximation have been investigated. The typical cases of the frequency of the field varying with time in the sine and rectangle forms have been considered. It is found that the collapse-revival phenomena and quick oscillations due to virtual photon processes of the atomic population inversion are deformed as the frequency changes with time in the sine form. The rectangular frequency modulation can lead to some new collapses and revivals in the evolution of the atomic population inversion. The sudden jumping of the field frequency can also lead to the sudden change of the quick oscillations due to virtual photon processes.