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Acta Physica Sinica

Fidelity of two-level atoms’ quantum states in a strong thermal radiation field

Deng-Yu Zhang, Guo Ping, Gao Feng, (1)衡阳师范学院物理系，衡阳 421008; (2)南华大学数理学院，衡阳 421001

Published Jan 1, 2007• 3 citations
Publisher

Abstract

The two-level atom is described by Pauli sign and the environment is described by infinite harmonic particle thermal reservoir. We have studied the problem of fidelity of quantum states of two-level atoms located in strongly thermal radiation field. The two-level atoms' reducible density rectangular array is obtained. We discuss the properties of fidelity. It is shown that for the two two-level atoms initially situated in different coherent superposition states, quantum information may partly lose fidelity or may not lose fidelity during evolution in transmission process.

DOI
10.7498/aps.56.1906

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The two-level atom is described by Pauli sign and the environment is described by infinite harmonic particle thermal reservoir. We have studied the problem of fidelity of quantum states of two-level atoms located in strongly thermal radiation field. The two-level atoms' reducible density rectangular array is obtained. We discuss the properties of fidelity. It is shown that for the two two-level atoms initially situated in different coherent superposition states, quantum information may partly lose fidelity or may not lose fidelity during evolution in transmission process.
The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir.A pair of two-level atoms' reducible density rectangular array is obtained when the Raman interaction of atoms with a thermal radiation field atoms by dipole-dipole interaction is put in a thermal reservoir.The paper has studied the fidelity of two-level atoms which are put in the strongly thermal radiation field.The properties of fidelity are discussed.It is shown that the two two-level atoms initially situated in different coherent superposition states,quantum information fidelities have obvious differences.
A model is built when the two two-level atoms is in thermal radiation field environment.By means of the density rectangular method,two two-level atoms'reducible density rectangular array is obtained when atoms by dipole-dipole interaction are put in a thermal reservoir.The problem of fidelity of two-level atoms is studied which are put in the strongly thermal radiation field.It is shown that the two two-level atoms initially situated in different coherent superposition states,quantum information may lose fidelities partly or may not lose fidelities during evolution in transmit process.The initial states may influence the losing fidelities speed obviously.
The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir.We have studied the entanglement of two-level atoms which are put in the strongly thermal radiation field.The two-level atoms' reducible density rectangular array is obtained.We discuss the properties of entanglement by virtue of concurrence.It is shown that the two two-level atoms initially situated in different coherent superposition states,entanglement of atoms have obvious dissimilarity.
The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir.We have studied the entanglement of the coupling two-level atoms which are put in the thermal radiation field.The two-level atoms′ reducible density rectangular array is obtained.We discuss the properties of entanglement by virtue of concurrence.It is shown that as the two two-level atoms are initially situated in different coherent superposition states,entanglement of atoms have obvious dissimilarity.
The interaction between radiation and two-level atom was investigated by semi-classical theory and quantum theory respectively.The fidelity of the two-level atom's quantum state was written out, The influences of the radiation intensity in the case of semi-classical theory and the photon number of the radiation in the case of quantum theory on the fidelity were discussed for different atomic initial states.It is found that the fidelity of quantum state is independent of radiation intensity when the atom is initially in a superposition state and the atom interacts resonantly with the radiation field in semi-classical theory. The atom's quantum fidelity evolves periodically with time,and its frequency is modulated by radiation intensity.Furthermore,it can effectively change quantum information fidelity when the appropriate detuning is selected.