Concurrence evolution of two qubits coupled with one-mode cavity separately

doi:10.1088/1674-1056/19/9/094204

中国物理B ›› 2010, Vol. 19 ›› Issue (9): 94204-094204.doi: 10.1088/1674-1056/19/9/094204

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇下一篇

Concurrence evolution of two qubits coupled with one-mode cavity separately

刘伟慈¹, 王发强², 梁瑞生²

(1)Computer Engineering Department of Nanhai Campus, South China Normal University, Foshan 528225, China; (2)Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China

收稿日期:2009-09-12 修回日期:2010-01-21 出版日期:2010-09-15 发布日期:2010-09-15
基金资助:
Project supported by the State Key Program for Basic Research of China(Grant No. 2007CB307002), and the Natural Science Foundation of Guangdong Province of China(Grant No. 8151063201000051).

Concurrence evolution of two qubits coupled with one-mode cavity separately

Liu Wei-Ci(刘伟慈)^a), Wang Fa-Qiang(王发强)^b)^†, and Liang Rui-Sheng(梁瑞生)^b)

^a Computer Engineering Department of Nanhai Campus, South China Normal University, Foshan 528225, China; ^b Laboratory of Photonic Information Technology, School of Information and Photoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China

Received:2009-09-12 Revised:2010-01-21 Online:2010-09-15 Published:2010-09-15
Supported by:
Project supported by the State Key Program for Basic Research of China(Grant No. 2007CB307002), and the Natural Science Foundation of Guangdong Province of China(Grant No. 8151063201000051).

摘要/Abstract

摘要： 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.

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.

Key words: decoherence, qubit, rotating-wave approximation, cavity

中图分类号:

4250

刘伟慈, 王发强, 梁瑞生. Concurrence evolution of two qubits coupled with one-mode cavity separately[J]. 中国物理B, 2010, 19(9): 94204-094204.

Liu Wei-Ci(刘伟慈), Wang Fa-Qiang(王发强), and Liang Rui-Sheng(梁瑞生). Concurrence evolution of two qubits coupled with one-mode cavity separately[J]. Chin. Phys. B, 2010, 19(9): 94204-094204.

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Concurrence evolution of two qubits coupled with one-mode cavity separately

Concurrence evolution of two qubits coupled with one-mode cavity separately

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