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arXiv 1002.3975math-phmath.MP
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固定迹Laguerre β系综的最小本征值分布

Smallest eigenvalue distribution of the fixed trace Laguerre beta-ensemble

Yang Chen, Dang-Zheng Liu, Da-Sheng Zhou

摘要:

本文研究了两体量子系统在随机纯态下约化密度矩阵的纠缠。它透露,这涉及到计算的最小特征值分布的固定迹拉盖尔合奏的$N\times N$随机矩阵。我们表明,有限的$N$的最小特征值分布可以表示在杰克多项式。此外,基于确切的结果,我们发现,一个限制的分布,当最小的特征值是适当的规模与$N$其次是一个大的$N$限制。我们的结果是相同的最小特征值分布的经典Laguerre系综没有固定的轨迹约束。这表明在广义上,全局约束不影响局部相关性,至少,在大的$N$限制。因此,我们解决了一个悬而未决的问题:确定约化密度矩阵的最小本征值分布--通过追踪环境自由度--对于一个不相等维度的二分量子系统。

英文摘要:

In this paper we study entanglement of the reduced density matrix of a bipartite quantum system in a random pure state. It transpires that this involves the computation of the smallest eigenvalue distribution of the fixed trace Laguerre ensemble of $N\times N$ random matrices. We showed that for finite $N$ the smallest eigenvalue distribution may be expressed in terms of Jack polynomials. Furthermore, based on the exact results, we found, a limiting distribution, when the smallest eigenvalue is suitably scaled with $N$ followed by a large $N$ limit. Our results turn out to be the same as the smallest eigenvalue distribution of the classical Laguerre ensembles without the fixed trace constraint. This suggests in a broad sense, the global constraint does not influence local correlations, at least, in the large $N$ limit. Consequently, we have solved an open problem: The determination of the smallest eigenvalue distribution of the reduced density matrix---obtained by tracing out the environmental degrees of freedom---for a bipartite quantum system of unequal dimensions.

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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