| Eigenvalues, Peres＇ Separability Condition, and Entanglement |
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| 摘 要： |
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| 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 |
| 收稿时间： | 2003-07-17 |
Eigenvalues,Peres' Separability Condition,andEntanglement |
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| WANG An-Min. Eigenvalues,Peres' Separability Condition,andEntanglement[J]. Communications in Theoretical Physics, 2004, 42(2): 206-210 |
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| Authors: | WANG An-Min |
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| Affiliation: | Institute for Theoretical Physics, Department of ModernPhysics, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | The general expression with the physical significance and positive-definite condition of the eigenvalues of 4×4 Hermitian and trace-one matrixare obtained. The obvious expression of Peres' separability condition for anarbitrary 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 ina qubit chain with noise. |
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| Keywords: | density matrix eigenvalues separability entanglement |
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