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Acta Sinica Quantum Optica

The Entropy Squeezing Properties in the Nonlinear Interaction Between Squeezing Vacuum State Field and Atom

Xiang-Ping Liao

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

The field entropy squeezing properties in the nonlinear interaction between squeezing vacuum state field and atom are studied by means of quantum information entropy theory. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entropy squeezing properties are discussed. The results show that the field entropy can be squeezed periodically without Kerr medium, and the nonlinear interaction intensity of Kerr medium can change the periodicities of evolution of the field entropy squeezing, the field may exhibit long-time entropy squeezing effect when the squeezing degree of initial squeezing vacuum state field is big ((r=5).)

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The field entropy squeezing properties in the nonlinear interaction between squeezing vacuum state field and atom are studied by means of quantum information entropy theory. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entropy squeezing properties are discussed. The results show that the field entropy can be squeezed periodically without Kerr medium, and the nonlinear interaction intensity of Kerr medium can change the periodicities of evolution of the field entropy squeezing, the field may exhibit long-time entropy squeezing effect when the squeezing degree of initial squeezing vacuum state field is big ((r=5).)
The properties of the entanglement in the intensity-dependent coupling interaction between squeezing vacuum state field and atom with an additional Kerr medium are investigated by using the von Neumann entropy. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entanglement of the quantum system are discussed. The results show that the nonlinear interaction of Kerr medium can result in the generation of the maximally entangled state, disentangled-free state or disentangled state, and the degree of entanglement is stationary.
The field entropy squeezing properties in the nonlinear Jaynes-Cummings model are studied by means of quantum information entropy, and the influences of the nonlinear interaction of the Kerr medium with the model field and the initial state of atoms on the field entropy squeezing are discussed. It shows that the nonlinear interaction of the Kerr medium can lead to an increase in the squeezing depth. On the other hand, the squeezing time and the squeezing depth increases with the increase of the atomic distribution angle.
The information entropy squeezing properties of the atom in motion interacting with the two-mode squeezing vacuum field via two-photon transition are studied by means of quantum theory.The influences of the velocity of atomic motion,the field structure and the parameter of squeezing field on the information entropy squeezing properties of the atom are investigated as the initial atom is in any state.The results indicate that the value of squeezed component of the atomic dipole,squeezed frequency,amplitude and squeezed direction of the atomic information entropy can be controlled by choosing the atomic initial state,the velocity of atomic motion,the field structure and the squeezing factor of field and the squeezing phase angle of the field,respectively.In the longer time,squeezing effects of the atom in motion can be obtained by choosing the system parameters.The mixing degree of atomic initial state has no influence on the entropy squeezing of the atom in motion.
The entropy properties of field in the system of coupled identical V-type three-level atoms interacting with vacuum field in cavity filled with Kerr-like medium are studied by means of quantum theory. The time evolution of entropy of field via the initial state of the atomic system,coupling coefficient between the atoms and Kerr coefficient are discussed.Numerical calculation results show that when the ground state and excited state of atoms are in appropriate superpositions state,the entropy of field is behaving periodic oscillation.The oscillation frequency and amplitude are depending on the coupling constant between atoms and the third-order nonlinear coefficient of Kerr-like medium.Therefore,the entropy of field is very sensitive to the atomic initial state.
In this paper,the field entropy evolution of two coupling atoms interacting with a single mode light field in Kerr medium is studied by means of the quantum theory.It has been shown that:the Kerr medium and the interaction of atoms will influence the periodicity of the evolution of the field entropy,make the connected degree between field and atoms weaken;the excited field intensity also influence the periodicity of the evolution of the field entropy,the connected degree between field and atoms is strengthened first and is weakened later when increases.