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arXiv quant-ph/0512256quant-ph
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基于二次函数的准多体纠缠度量

Quasi multipartite entanglement measure based on quadratic functions

Jing Zhang, Chun-Wen Li, Re-Bing Wu, Tzyh-Jong Tarn, Jian-Wu Wu

摘要:

通过推广Jaeger的Minkowski范数纠缠测度,得到了一种新的纠缠测度.这种测量可以应用于更广泛的多体混合态,尽管仍然是“准”的,因为它仍然不能精确地划分所有可分离和纠缠态的集合。作为系统密度矩阵的二次标量函数,准测度可以很容易地用系统密度矩阵的所谓相干矢量表示,由此我们得到了准测度的基本性质,包括(1)对所有可分态的零纠缠,(2)在局域幺正操作下的不变性,以及(3)在局部POVM(正算子值测度)测量下不增加。这些结果为进一步研究开放系统中的动力学问题,特别是纠缠的动态演化,以及对抗环境诱导退相干效应的纠缠保持等问题开辟了前景。

英文摘要:

We develop a new entanglement measure by extending Jaeger's Minkowskian norm entanglement measure. This measure can be applied to a much wider class of multipartite mixed states, although still "quasi" in the sense that it is still incapable of dividing precisely the sets of all separable and entangled states. As a quadratic scalar function of the system density matrix, the quasi measure can be easily expressed in terms of the so-called coherence vector of the system density matrix, by which we show the basic properties of the quasi measure including (1) zero-entanglement for all separable states, (2) invariance under local unitary operations, and (3) non-increasing under local POVM (positive operator-valued measure) measurements. These results open up perspectives in further studies of dynamical problems in open systems, especially the dynamic evolution of entanglement, and the entanglement preservation against the environment-induced decoherence effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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