The entanglement between two isolated atoms in double mode--mode competition model |
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Authors: | Wu Qin Fang Mao-F Cai Jian-Wu and Hu Yao-Hua |
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Affiliation: | College of Physics and Information Science, Hunan Normal University, Changsha 410081, China; Department of Physics, Hunan Industrial University, Zhuzhou 412007, China; School of Basic Medical Science, Guangdong Medical College, Dongguan 523808, China |
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Abstract: | Extending the double Jaynes--Cummings model to a more
complicated case where the mode--mode competition is considered, we
investigate the entanglement character of two isolated atoms by
means of concurrence, and discuss the dependence of atom--atom
entanglement on the different initial state and the relative
coupling strength between the atom and the corresponding cavity
field. The results show that the amplitude and the period of the
atom--atom entanglement evolution can be controlled by the choice of
initial state and relative coupling strength, respectively. We find
that the phenomenon of entanglement sudden death (ESD) is sensitive
to the initial conditions. The length of the time interval for
zero entanglement depends not only on the initial degree of
entanglement between two atoms but also on the relative coupling
strength of atom--field interaction. The ESD effect can be weakened
by enhancing the mode--mode competition between the three- and
single-photon processes. |
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Keywords: | double mode--mode competition model concurrence entanglement sudden death |
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