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arXiv quant-ph/0605079quant-ph
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纠缠的几何学方面

Geometrical aspects of entanglement

Jon Magne Leinaas, Jan Myrheim, Eirik Ovrum

摘要:

我们研究纠缠的几何方面,与希尔伯特-施密特范数定义的度量上的密度矩阵。我们首先集中在两个两级系统的最简单的情况下,并表明,一个“相对论”的制定导致一个完整的分析问题的可分性。我们的方法是基于施密特分解的密度矩阵的复合系统和非酉变换的标准形式。密度矩阵的正性对于该方法的工作是至关重要的。类似的方法在更高的维度上也有一定的作用,但功能不太强大。我们进一步提出了一种数值方法来检验可分性,并通过两个三能级系统的复合系统中束缚纠缠的数值研究来说明这种方法。

英文摘要:

We study geometrical aspects of entanglement, with the Hilbert--Schmidt norm defining the metric on the set of density matrices. We focus first on the simplest case of two two-level systems and show that a ``relativistic'' formulation leads to a complete analysis of the question of separability. Our approach is based on Schmidt decomposition of density matrices for a composite system and non-unitary transformations to a standard form. The positivity of the density matrices is crucial for the method to work. A similar approach works to some extent in higher dimensions, but is a less powerful tool. We further present a numerical method for examining separability, and illustrate the method by a numerical study of bound entanglement in a composite system of two three-level systems.

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