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Acta Physica Sinica

THE INFLUENCE ON THE LIGHT SQUEEZING DUE TO VIRTUAL PHOTON PRECESSES

PENG JIN-SHENG, LI GAO-XIANG, (1)华中理工大学激光技术国家重点实验室,武汉430074; (2)华中师范大学物理系,武汉430070;中国高等科学技术中心(世界实验室),北京100080

Published Jan 1, 1993• 1 citation
Publisher

Abstract

In this paper, we have examined the influence of the counter-rotating terms on the sque-ezing phenomenon of the field in the two-photon Jaynes-Cummings model by means of the non-relativestic quantum electrodynamics. We verified that the effect of the virtual photon field in-creases the squeezing. The relation between the degree of squeezing and the field frequency, the mean photon number and the atom-field coupling constant has also analyzed.

DOI
10.7498/aps.42.568

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In this paper, we have examined the influence of the counter-rotating terms on the sque-ezing phenomenon of the field in the two-photon Jaynes-Cummings model by means of the non-relativestic quantum electrodynamics. We verified that the effect of the virtual photon field in-creases the squeezing. The relation between the degree of squeezing and the field frequency, the mean photon number and the atom-field coupling constant has also analyzed.
By means or investigating the time evolution of the atomic dipole squeezing and the field squeezing in the one-photon Jaynes-Cummings model and the nondege-nerate two-photon Jaynes-Cummings model, the relations between atomic dipole squeezing and squeezing in the radiating field are examined. The conditions under which the atom in atomic dipole squeezed state can radiate squeezed light are presented. The properties of the squeezing transformation between atomic dipole quadrature components and field quadrature components are also discussed. And in the atom-field coupling system, the two-photon transtion processes in producing squeezed light are superior to the one-photon transition processes.
The squeezing properties of binomial state field interacting with Bose-Einstein condensate of two-level atoms are investigated within and without rotating-wave approximation by means of quantum theory. The influences of atomic eigenfrequency, the coupling constant between light field and atoms，the parameter of light field and the virtual photon field on squeezing properties have been discussed. The results show that two quadrature components can be squeezed periodically, and the duration of squeezing light has something to do with atomic eigenfrequency ω, and the degree of squeezing with the parameter of the binomial states field η and the virtual photon field. The frequency of light fluctuations collapse and revival is determined by the coupling constant between light field and atoms.