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arXiv quant-ph/0106042quant-ph
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三量子比特纯态纠缠单调的性质

Properties of Entanglement Monotones for Three-Qubit Pure States

Robert Gingrich

摘要:

分析了三量子比特纯态局域幺正变换下轨道的各种参数化。的可互换性,对称性,参数范围,可计算性和测量下的行为。结果表明,任何多体纯态的纠缠单调性唯一地决定了该态在局域么正变换下的轨道。由此可知,对于三比特纯态,纠缠单调性依赖于[Phys.Rev.A60,910(1999)]中定义的Kempe不变量。提出了这种纠缠单调的一种形式。证明了一个定理,显着减少了纠缠单调的数量,必须看,找到最大的概率转换一个多体状态到另一个。

英文摘要:

Various parameterizations for the orbits under local unitary transformations of three-qubit pure states are analyzed. The interconvertibility, symmetry properties, parameter ranges, calculability and behavior under measurement are looked at. It is shown that the entanglement monotones of any multipartite pure state uniquely determine the orbit of that state under local unitary transformations. It follows that there must be an entanglement monotone for three-qubit pure states which depends on the Kempe invariant defined in [Phys. Rev. A 60, 910 (1999)]. A form for such an entanglement monotone is proposed. A theorem is proved that significantly reduces the number of entanglement monotones that must be looked at to find the maximal probability of transforming one multipartite state to another.

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