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Journal of Atomic and Molecular Physics

Fidelily of quantum information in a pair atoms of entanglement state interacting with the squeezed vacuum field

Tian Yong-hong, Dahai Xu

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

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.

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Journal of Atomic and Molecular Physics•Jan 1, 2006•0 citations
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.
In this article,the squeezing properties of light in the system of two identical two-level entangled atoms Raman interacting with the coherent optical field are studied.The results obtained by numerical method show that light squeezing effects depend on the mean photon numbers of the coherent optical field and the degree of entanglement of the initial two identical two-level entangled atoms,with the increasing of the degree of entanglement of the initial two entangled atoms,the average value of the fluctuation of two quadrature components of light decreases and the squeezing time is prolonged.
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 quantum information Fidelity of two entangled-atoms interacting with coherent state light-field is studied by means of quantum theory.The results show that quantum information fidelity of system,atoms and light field will drastically decrease as the intensity of field increases.The fidelity of system and field will increase and vary simultaneously with the increasing of atoms' dipole-dipole interaction,but the fidelity of atoms will increase obviously. The atoms' entanglement has a little influence on the fidelity of system,atom and light field.
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.