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腔场QED与量子点系统激子纠缠态的制备及消纠缠研究(英文)
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作者 向少华 施振刚 宋克慧 《量子光学学报》 CSCD 北大核心 2007年第3期177-181,共5页
利用量子点与单模腔场共振相互作用模型提出了激子Bell类和W类纠缠态的制备方案。借助于超算符方法和态的保真度考察了所制备的激子纠缠态的消相干特性,结果表明:激子Bell类和W态的纠缠特性非常脆弱,在极短的时间里演变为消纠缠态。基... 利用量子点与单模腔场共振相互作用模型提出了激子Bell类和W类纠缠态的制备方案。借助于超算符方法和态的保真度考察了所制备的激子纠缠态的消相干特性,结果表明:激子Bell类和W态的纠缠特性非常脆弱,在极短的时间里演变为消纠缠态。基于腔场与两量子点共振相互作用模型设计了一个量子交换门。 展开更多
关键词 激子纠缠态 腔场QED 量子交换门 消相干效应
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Decoherence Effects on Multiplayer Cooperative Quantum Games
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作者 Salman Khan M.Ramzan M.Khalid.Khan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第8期228-234,共7页
We study the behavior of cooperative multiplayer quantum games [Q. Chen, Y. Wang, J.T. Liu, and K.L. Wang, Phys. Lett. A 327 (2004) 98; A.P. Flitney and L.C.L. Hollenberg, Quantum Inf. Comput. 7 (2007) 111] in the... We study the behavior of cooperative multiplayer quantum games [Q. Chen, Y. Wang, J.T. Liu, and K.L. Wang, Phys. Lett. A 327 (2004) 98; A.P. Flitney and L.C.L. Hollenberg, Quantum Inf. Comput. 7 (2007) 111] in the presence of decoherence using different quantum channels such as amplitude damping, depolarizing and phase damping. It is seen that the outcomes of the games for the two damping channels with maximum values of decoherence reduce to same value. However, in comparison to phase damping channel, the payoffs of cooperators are strongly damped under the influence amplitude damping channel for the lower values of decoherence parameter. In the case of depolarizing channel, the game is a no-payoff game irrespective of the degree of entanglement in the initial state for the larger values of decoherence parameter. The deeoherenee gets the cooperators worse off. 展开更多
关键词 multiplayer cooperative quantum games payoffs Nash equilibria
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