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Separability and Entanglement of Composite Quantum Systems

1998; American Physical Society; Volume: 80; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.80.2261

1092-0145

Maciej Lewenstein, Anna Sanpera,

Quantum Computing Algorithms and Architecture

We provide a constructive algorithm to find the best separable approximation to an arbitrary density matrix of a composite quantum system of finite dimensions. The method leads to a condition of separability and to a measure of entanglement.