An area law for entanglement from exponential decay of correlations

An area law for entanglement from exponential decay of correlations
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相关性指数衰减纠缠的面积定律

DOI:
10.1038/nphys2747
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发表时间:
2013
期刊:
影响因子:
19.6
通讯作者:
Brandão F
Brandão F
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Brandão F

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量子多体系统中纠缠的面积定律提供了关于其低温行为的有用信息,并与良好的数值模拟的可能性密切相关。量子多体物理学的一种直觉表明,只要系统中的关联出现指数衰减,面积定律就应该成立,例如,在物质的非临界相中发现了这种特性。然而,量子数据隐藏态的存在-即具有非常小的相关性,但纠缠的体积比例-的存在被认为是这种暗示的严重障碍。本文证明了尽管存在信息隐藏现象,但满足关联指数衰减的一维量子多体态总是满足面积定律。为了获得这一结果,我们结合了量子信息理论中的几个最新进展,从而表明该领域对于解决物理其他领域的问题是有用的。
Area laws for entanglement in quantum many-body systems give useful information about their low-temperature behaviour and are tightly connected to the possibility of good numerical simulations. An intuition from quantum many-body physics suggests that an area law should hold whenever there is exponential decay of correlations in the system, a property found, for instance, in non-critical phases of matter. However, the existence of quantum data-hiding states—that is, states having very small correlations, yet a volume scaling of entanglement—was believed to be a serious obstruction to such an implication. Here we prove that notwithstanding the phenomenon of data hiding, one-dimensional quantum many-body states satisfying exponential decay of correlations always fulfil an area law. To obtain this result we combine several recent advances in quantum information theory, thus showing the usefulness of the field for addressing problems in other areas of physics.
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DOI: --
发表时间: 1985
期刊:
影响因子: --
作者:
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