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,and
Entanglement |
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Authors: | WANG An-Min |
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Institution: | Institute for Theoretical Physics, Department of Modern
Physics, 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 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. |
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Keywords: | density matrix eigenvalues separability entanglement |
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