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Chinese Journal of Quantum Electronics

Phase properties in the model of two coupling two-level atoms interacting with squeezed coherent light-field

Tao Xiang-yang

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

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.

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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 .
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.
The photon statistical evolution in the process of two coupling two-level atoms interacting with the squeezed coherent state light field is investigated by means of the interacting picture and the quantum theory. Meanwhile, the influence of the squeezed light field factor γ, the coherent vibration amplitude |α|2 of the field-atom, the coupling constant g of two atoms and the coupling constant λ of atom-field on the mean photon number n(t) of stimulated field are also discussed. The relations of them are revealed.
The quantum properties of light in the system of two different atoms interacting with two-mode squeezing vacuum field are studied.The effect of the relative coupling constant(R=g1/g2) and initial squeezed parameter r on light squeezing effect and the photon bunching and antibunching are discussed.The numerical results show that vibration range of quantum fluctuation,the biggest squeezing depth and squeezing time and vibration amplitude of second-order coherence is affected by the initial squeezed parameter r.The variation of quantum fluctuation and second-order coherence versus time are affected by the relative coupling constant R.As a result,the squeezing time of quantum fluctuation,the time when light field is in non-classical states and the degree of photon antibunching are also affected by it,but to but it doesn′t have obvious influence on light squeezing depth.