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Journal of Jimei University

The Wigner-Yanase Information of Two Coupled Two-level Atoms Interacting with Two-mode Squeezed Vacuum Field

Mi Li

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

The change of the total Wigner-Yanase skew information of two coupled two-level atoms interacting with two-mode squeezed vacuum state field was investigated. The results showed that when the squeezed factor was smaller,the interaction between atoms and field,the dipole-dipole interaction of two atoms determined evolution period of the total Wigner-Yanase skew information together; enhancing the dipoledipole interaction of two atoms could resist the loss of the total Wigner-Yanase skew information; the squeezed factor of light field played an important role in the loss of the total Wigner-Yanase skew information,and when the squeezed factor was bigger,the total Wigner-Yanase skew information of atoms would lose completely.

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The change of the total Wigner-Yanase skew information of two coupled two-level atoms interacting with two-mode squeezed vacuum state field was investigated. The results showed that when the squeezed factor was smaller,the interaction between atoms and field,the dipole-dipole interaction of two atoms determined evolution period of the total Wigner-Yanase skew information together; enhancing the dipoledipole interaction of two atoms could resist the loss of the total Wigner-Yanase skew information; the squeezed factor of light field played an important role in the loss of the total Wigner-Yanase skew information,and when the squeezed factor was bigger,the total Wigner-Yanase skew information of atoms would lose completely.
The fidelities of quantum information of two identical two-level atoms of entanglement state Raman interacting with the squeezed vacuum field are studied by means of the fully quantum theory and numerical calculations.The results shows the fidelity of system,atoms and field will drastically decrease as the squeezing parameter of the initial light increases,and that the fidelity is correlated with the degree of entanglement of the initial two identical two-level atoms and the intensity of dipole-dipole interaction between atoms.
The dipole-dipole interaction of the two atoms is discussed.By considering the in- teraction between the two-mode squeezing vacuum state field and the environment(atoms),we investigate the quantum information fidelities of the atoms the field and the system in two- mode squeezing vacuum state Tavis-Cummings model.With the help of the computer sim- ulation,the time evolution of fidelity of system,atoms and field is obtained.The result is indicate that r and k are important to the fidelity of the quantum information.When the two atoms are initially in the groud state,decreasing r can increase the three fidelities.On the contrary,when the two atoms are initially in one of the Bell states,increasing r can increase the three fidelites.
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.
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.