Concurrence evolution of two qubits coupled with one-mode cavity separately |
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| Authors: | Liu Wei-Ci Wang Fa-Qiang Liang Rui-Sheng |
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| Affiliation: | Computer Engineering Department of Nanhai Campus, South China Normal University, Foshan 528225, China; Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China |
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| Abstract: | The concurrence evolution of two qubits coupled with one-mode cavity separately is investigated exactly without adopting the rotating-wave approximation. The results show that for the resonant case, the concurrence evolution behaviour of the system is similar to that of the Markovian case when the coupling strength is weak, while the concurrence vanishes in a finite time and might revive fractional initial entanglement before it permanently vanishes when the coupling strength is strong. And for the detuning case, the entanglement could periodically recover after complete disentanglement. These results are quite different from those of system subjected to Jaynes--Cummings model. |
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| Keywords: | decoherence qubit rotating-wave approximation cavity |
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