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Journal of Hunan Institute of Engineering

Fidelity of Quantum Information of Binomial Field Interacting with Pair Atoms of Entanglement State

XU Mai-chang

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

Quantum theory is used to study the fidelity of quantum information of binomial light field interacting with pair atoms of entanglement state.The effect of binomial light field and the degree of entanglement of the pair atoms on the fidelity is discussed by numerical method.The results show that we can acquire high fidelity exportation of the light field with selecting the parameters of entangled atom pair and binomial light field parameters,and function time of the light and atom.

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Quantum theory is used to study the fidelity of quantum information of binomial light field interacting with pair atoms of entanglement state.The effect of binomial light field and the degree of entanglement of the pair atoms on the fidelity is discussed by numerical method.The results show that we can acquire high fidelity exportation of the light field with selecting the parameters of entangled atom pair and binomial light field parameters,and function time of the light and atom.
The fidelity evolution of quantum state under the interaction of the binomial photon field and atomic Bose-Einstein condensate (BEC) are studied by full quantum theory.The influences of the interaction among atoms of BEC,the average atomic number of atomic BEC and the parameter of light field on the fidelity are investigated.The results indicate that the amplitude and oscillated period of fidelity of quantum information for the interaction system can be controlled by choosing the intensity of the interaction among atoms and the average atomic number on the ground state.And the change of the light parameter only plays a role on the fidelity effect.The higher fidelity can be obtained.by choosing suitable parameters.
By means of numerical methods,we studied the fidelity of the system which contained a moving two-level atom and the binomial light field.The impact of different initial states is discussed to the fidelity of quantum states.The result showed that the velocity of atom effect the oscillation period of the fidelity,and different initial state of atom and the optical field parameters on the fidelity have a bigger influence.When the atom is in superposition state and the field has a bigger initial average number of photons the fidelity of the system has a higher value.
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 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.
In this article, the quantum properties of light field of the two identical two-level entangled atoms interacting with the binomial optical field were studied by means of time evolution operator and numerical calculations. The results show that the time evolution of the squeezing and coherence properties of the light field depends on the entanglement degree of the initial two identical two-level entangled atoms and the parameters of the binomial optical field. The optical field fluctuation can be completely squeezed via choosing appropriate parameters.
We have studied fidelity of two-level atom interacting with nonlinear coherent state light field by numerical calculation method.The variations of the fidelity with the parameter of light field,initial states of the atom and Lamb-Dicke parameter of the nonlinear coherent state are discussed respectively.It is shown that we can find light field state with larger average fidelity and smaller oscillation amplitude by selecting the appropriate parameters.If we regard light field as a quantum information carrier,to find high-fidelity nonlinear coherent states is to find a strong anti-interference ability quantum state which has great application value in quantum communication process.