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Acta Physica Sinica

Properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field

Qian Yan, Ma Ai-Qun, MA Zhi-min, Liu Zheng-jun, Shutian Liu, (1)广州大学城市建设学院，广州 510900; (2)哈尔滨工业大学物理系，哈尔滨 150001; (3)哈尔滨师范大学呼兰学院，哈尔滨 150050; (4)黑龙江大学物理科学与技术学院，哈尔滨 150080

Published Jan 1, 2007• 1 citation
Publisher

Abstract

The properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field are studied using the Pegg-Barnett phase theory. The phase probability distribution and variance are calculated. The evolution of the phase probability distribution functions in some cases are given by curves in the polar coordinate system. The influence of Raman interaction between the coupled atoms with squeezed vacuum field, the dipole-dipole interaction between the atoms and the initial states of atoms on the phase properties are discussed.

DOI
10.7498/aps.56.4571

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The properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field are studied using the Pegg-Barnett phase theory. The phase probability distribution and variance are calculated. The evolution of the phase probability distribution functions in some cases are given by curves in the polar coordinate system. The influence of Raman interaction between the coupled atoms with squeezed vacuum field, the dipole-dipole interaction between the atoms and the initial states of atoms on the phase properties are discussed.
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The field entropy evolution properties in the system of two coupling atoms Raman interactions with a single-mode squeezed vacuum field are studied by means of quantum theory. Using the numerical method, the relation between the field entropy evolution properties and the coupling constant of two atoms and the coupling constant of atom-field and the squeezing degree of initial squeezing vacuum field is discussed. The results show that the field entropy evolution properties are similar to the time evolution of atomic particle's occupancy. If the dipole-dipole interaction between atoms in weaker, there will be the oscillation of collapse-and-revival the field entropy evolution properties. If the dipole-dipole interaction between atoms is stronger, the field entropy evolution properties will produced the oscillation anomaly.
The phase properties in the system of the coupling two-level atoms interacting with squeezed coherent-state light-field is studied from the point of the Pegg-Barnett phase theory. The phase probability distribution and the phase fluctuation are investigated. Meanwhile, the influence of the field amplitude, the compressed parameter, and the coupling coefficient between atoms on the phase properties is also discussed. The results show that the phase probability distribution presents three-peak Gaussian configuration. The maximum of the phase probability distribution lies at the point of the zero phase arid the phase fluctuation is small, while at other place the value of the phase probability distribution is relatively small and vibrates easily. At the same time, because of the influence of light-field squeezing effect, the phase probability distribution is different from that of coherent-state field.
The phase probability distribution of two coupling atoms interacting with a coherent light field in Kerr medium is studied by using the Pegg-Barnett theory. The influence of the coupling coefficient g between atoms, the coupling coefficient λ of atom and field ,the mean photon number of initial field on the phase probability distribution function in the system with and without Kerr medium is discussed respectively .The evolution of the phase probability distribution with time is also discussed .