Degree of Entanglement and Violation of Bell Inequality by Two-Spin-1/2 States  

作　　者：K.Berrada Y.Hassouni H.Eleuch 

机构地区：[1]Institut fr Angewandte Physik,Technische Universitt Darmstadt,D-64289 Darmstadt,Germany [2]Laboratoire de Physique Theorique URAC 13,Departement de Physique Faculte des Sciences,Universite Mohammed V-Agdal Av.Ibn Battouta,B.P.1014-Agdal,Rabat,Morocco [3]Institute for Quantum Studies and Department of Physics Texas University,TX 77843,USA

出　　处：《Communications in Theoretical Physics》2011年第10期679-686,共8页理论物理通讯（英文版）

摘　　要：Bell inequality is violated by the quantum mechanical predictions made from an entangled state of the composite system. In this paper we examine this inequality and entanglement measures in the construction of the coherent states for two-qubit pure and mixed states, we find a link to some entanglement measures through some new parameters （amplitudes of coherent states）. Conditions for maximal entanglement and separability are then established for both pure and mixed states. Finally, we analyze and compare the violation of Bell inequality for a class of mixed states with the degree of entanglement by applying the formalism of Horodecki et al.

关 键 词：Bell inequality quantum entanglement coherent states pure and mixed states 

分 类 号：O413.1[理学—理论物理] V474.24[理学—物理]