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arXiv quant-ph/0508236quant-phcond-mat.stat-mech
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量子相变中纠缠的局域测度和临界指数

Local Measures of Entanglement and Critical Exponents at Quantum Phase Transitions

L. Campos Venuti, C. Degli Esposti Boschi, G. Morandi, M. Roncaglia, A. Scaramucci

摘要:

我们讨论了一般的理由,一些本地的纠缠指标,最近提出的研究和分类的量子相变。特别是,我们专注于纠缠在检测量子临界点和相关指数的能力。我们发现,在所有的本地措施的纠缠观察到的奇异性的缩放假设的后果。特别地,由于每个非平凡的局部观测值在临界点都是奇异的,我们挑选出最相关的一个(在重整化群意义上)作为最适合有限尺寸标度分析的对象。用一对一维自旋系统对所提出的方法进行了检验。目前的分析表明,奇异行为的本地措施纠缠是完全包含在通常的统计力学框架。

英文摘要:

We discuss on general grounds some local indicators of entanglement, that have been proposed recently for the study and classification of quantum phase transitions. In particular, we focus on the capability of entanglement in detecting quantum critical points and related exponents. We show that the singularities observed in all local measures of entanglement are a consequence of the scaling hypothesis. In particular, as every non-trivial local observable is expected to be singular at criticality, we single out the most relevant one (in the renormalization group sense) as the best-suited for finite-size scaling analysis. The proposed method is checked on a couple of one-dimensional spin systems. The present analysis shows that the singular behaviour of local measures of entanglement is fully encompassed in the usual statistical mechanics framework.

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