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Jiguang zazhi

Quantum information fidelity of entangled atoms interacting with coherent state light-field in T-C model

Guojun Liu

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

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.

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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 field entropy evolution of two entangled-atoms interacting with coherent state light-filed is studied by means of quantum theory.The influence of the dipole-dipole interaction,the intensity of field and the two-atom's entanglement on the field entropy properties are studied.The results show that the increasing of the atomic dipole-dipole interaction will increase evolution period of field entropy.The mean-value of entropy will increase at first and then decrease with the intensity of field increasing.The oscillation period of field entropy increases with the increase of the intensity of field.The mean-value of field entropy will decrease with the increasing of atoms' entanglement,but the oscillation of field entropy will increase with the increasing of the entanglement of atoms.
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 evolution of quantum information of light field fidelity in the percedure interaction between two atoms and light field under considering atom-atom coupling and intensity-dependent coupling are investigated by mean of full quantum theory and numerical computation method.The results show that the light field fidelity relates closely with intensity of initial light field,coefficient of field-atom coupling,and coefficient of atom-atom coupling.The influence of these factors leads to fidelity oscillation.It is advantageous of improving the light field fidelity if controlling and making intensity of light weak and atom-atom coupling strong.The more stronger initial light intensity or atom-field coupling,the faster the frequency of light field fidelity and the more obvious varying regularity.The fidelity present also collapse-revert when initial light intensity or atom-atom coupling is strong.The light field could keep steady state during strongly coupling between atom and light field.
The quantum entanglement of two entangled atoms interacting with the squeezed coherent state is studied by means of full quantum theory. The influences of coherent amplitude factor, squeezing factor, ratio of two coupling coefficients on the entanglement property are discussed. The results show that two atoms entanglement evolution property is opposed to atom-field entanglement evolution property when the coherent amplitude factor was zero or small. The interaction of the atoms and field weakens the entanglement degree of atom-atom. With increasing coherent amplitude factor or decreasing squeezing factor of light, the time of two atoms staying in the steady entangled state becomes longer. The increase of the coherent amplitude factor or the decrease of squeezing factor of light lead to the increase of atom-atom entanglement degree while the decrease of atoms-field entanglement degree. Moreover, the two-atom quantum state stays in the maximum entangled state when the atomic dipole-dipole coupling coefficient is large enough.
The process of two-atom interacting with light field under considering atom-atom coupling and intensity-dependent coppling are investigated by mean of full quantum theory.The analysis law of evolutionary process of atomical fidelity is obtained.It is found that the variation of atomical fidelity with time presents the oscillation characteristics.The light field could revert to the initial coherent state at some microtime and the value of atomical fidelity less than 1 during most of interacting process,that is,both light fields and atoms are in complex entangled states.The above mentioned show that the interaction between atoms and light fields may leads to maintaining or cancaling the initial entanglement states.
The entanglement character of two entangled atoms interacting with the binomial light-field in a multiphoton Tavis-Cumming model(T-C model) is studied by means of the quantum theory.The influences of the optical field parameters and the atomic dipole-dipole coupling intensity of the atoms on the properties of the entanglement between two atoms under different initial states are discussed.The results indicate that the periodicity of the entanglement between two atoms is influenced by the parameters of the binomial optical field.There are the entanglement phenomena at some values of nπ except the value of 5nπ(n=0,1,2,…).With the increase of the parameters of the binomial optical field,the range appearing entanglement phenomenon will increase gradually.Thereby the time in that the entanglement between the two atoms occurs will diminish.The atomic dipole-dipole coupling intensity has an effect on oscillating of entanglement and the entanglement degree between the two atoms.