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Chinese Journal of Quantum Electronics

Entropy evolution properties of field in the system of two-mode squeezing vacuum field interacting with two coupling atoms

HE Jin-yu

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

The entropy evolution properties of field in the system of two-mode squeezing vacuum field interacting with two coupling atoms are studied by means of quantum theory. The influences of the squeezed factor of light field, initial states of an atom ,the coupling constant of two atoms and the coupling constant of atom-field on the entropy evolution properties of field is also discussed.

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Journal of Shaanxi Normal University•Jan 1, 2006•0 citations
The entropy evolution properties of field in the system of two-mode squeezing vacuum field interacting with two coupling atoms are studied by means of quantum theory. The influences of the squeezed factor of light field, initial states of an atom ,the coupling constant of two atoms and the coupling constant of atom-field on the entropy evolution properties of field is also discussed.
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 entropy evolution properties of field in the system of two-mode squeezing vacuum field interacting with the atomic motion are studied by means of quantum theory.The influences of atomic motion and the field structure in different initial states are discussed emphatically.The results show that the field entropy is determined by the velocity of the atomic motion and the parameter of the field mode structure through time parameter sin~2(epgt/2).The atomic motion and the parameter of the field mode structure lead to additional vibration entropy.
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 properties of quantum field entropy evolution in the system of a single-mode squeezed coherent states field interacting with a pair of identical coupled two-level atoms is studied by utilizing of the complete quantum theory,and the influences of the field squeezing parameter,the coupling strength between the field and the atoms and the coupling strength between the two identical two-level atoms on properties of evolution of quantum field entropy are discussed.The results obtained from the numerical results indicate that the field squeezing parameter influences the amplitude of vibration of the field quantum entropy evolution,the coupling strength between the field and the atoms affects the periodicity of the evolution of the field quantum entropy,while the coupling strength between the two identical two-level atoms influences not only the amplitude of the oscillation of the field quantum entropy evolution but also its periodicity.
The dipole difference squeezing of a pair atoms is defined. The time evolution properties of difference squeezing of atomic dipole and amplitude-squared squeezing of light in the system of a single-mode squeezing vacuum field Raman interacting with two coupled-atoms are studied by means of quantum theory. Using the numerical method, influences of the initial squeezing parameter of light, the atomic initial state and the intensity of dipole-dipole interaction between atoms on the squeezing properties of atom and light are discussed.
According to the complete quantum theory,the quantum field-entropy evolution properties in a system of the two coupled two-level atoms interacting with a single-mode odd-coherent state light field are studied.Through numerical calculation the influence of the initial mean photon number n_0,the coupled intensity g of interaction between the single-mode field and atoms,and the coupled intensity g_a of dipole-dipole interaction between the two coupled atoms on the quantum field-entropy evolving while the initial state of the light field is a single-mode odd-coherent and the two coupled two-level atoms lay in different Einstein Poclolsky Rosen(EPR) entangled state respectively.The results indicate that the time evolving of quantum field-entropy is closely related to the initial atoms state.The quantum field-entropy evolution can display the phenomena of entanglement and disentanglement while they are periodically under the condition of intensity field(n_01). Meanwhile the phenomena of quantum interference is also discovered.The periodicity of the quantum field-entropy anomalous oscillation decreases gradually with the increasing of g values.When g_a is an especial constant,it is shown that the phenomena of period collapse-reversion can present.