Eigenvalues, Peres＇ Separability Condition, and Entanglement  

作　　者：WANGAn-Min 

机构地区：InstituteforTheoreticalPhysics,DepartmentofModernPhysics,UniversityofScienceandTechnologyofChina,Hefei230026,China

出　　处：《Communications in Theoretical Physics》2004年第2X期206-210,共5页理论物理通讯（英文版）

基　　金：国家重点基础研究发展计划(973计划)，安徽省自然科学基金

摘　　要：The general expression with the physical significance and positive-definite condition of the eigenvalues of 4 × 4 Hermitian and trace-one matrix are obtained. The obvious expression of Peres' separability condition for an arbitrary state of two qubits is then given and its operational feature is enhanced. Furthermore, we discuss some applications to the calculation of the entanglement, the upper bound of the entanglement, and a model of the transfer of entanglement in a qubit chain with noise.

关 键 词：本征值 密度矩阵 纠缠 量子论 厄密共轭矩阵 可分离性 

分 类 号：O413[理学—理论物理]