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arXiv 1709.04313quant-phhep-thmath-phmath.MP
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量子设计的广义纠缠熵

Generalized Entanglement Entropies of Quantum Designs

Zi-Wen Liu, Seth Lloyd, Elton Yechao Zhu, Huangjun Zhu

摘要:

随机量子态或动力学的纠缠特性对于从量子信息到高能和多体物理的广泛物理学科的研究都是重要的。本文研究了纯态和幺正信道中纠缠度和随机度之间的相互作用。我们揭示了设计(状态或幺正的分布,匹配的统一Haar措施的某些时刻)和广义熵(熵函数,依赖于密度算子的某些权力)之间的强连接,通过显示雷尼纠缠熵平均超过设计的相同顺序几乎是最大的。这加强了著名的佩奇定理。此外,我们发现,设计的顺序是对数的维度最大化所有雷尼纠缠熵,所以是完全随机的纠缠谱。我们的研究结果将Rényi纠缠熵的行为与随机性程度方面的置乱和量子混沌的复杂性联系起来,并提出了快速置乱猜想的推广。

英文摘要:

The entanglement properties of random quantum states or dynamics are important to the study of a broad spectrum of disciplines of physics, ranging from quantum information to high energy and many-body physics. This work investigates the interplay between the degrees of entanglement and randomness in pure states and unitary channels. We reveal strong connections between designs (distributions of states or unitaries that match certain moments of the uniform Haar measure) and generalized entropies (entropic functions that depend on certain powers of the density operator), by showing that Rényi entanglement entropies averaged over designs of the same order are almost maximal. This strengthens the celebrated Page's theorem. Moreover, we find that designs of an order that is logarithmic in the dimension maximize all Rényi entanglement entropies, and so are completely random in terms of the entanglement spectrum. Our results relate the behaviors of Rényi entanglement entropies to the complexity of scrambling and quantum chaos in terms of the degree of randomness, and suggest a generalization of the fast scrambling conjecture.

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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