arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.03536quant-phcond-mat.stat-mechcond-mat.str-elhep-thphysics.atom-ph
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多体波函数的突现量子态设计

Emergent quantum state designs from individual many-body wavefunctions

Jordan S. Cotler, Daniel K. Mark, Hsin-Yuan Huang, Felipe Hernandez, Joonhee Choi, Adam L. Shaw, Manuel Endres, Soonwon Choi

摘要:

多体系统中的量子混沌提供了一个强预测能力的统计和量子物理之间的桥梁。这一框架对于分析复杂量子系统的性质,如能谱和热化动力学是有价值的。虽然量子混沌的当代方法通常依赖于量子态和哈密顿量的随机集合,但这并不能反映大多数现实世界的系统。在本文中,我们引入了一个新的视角:在广泛的例子中,一个单一的非随机量子态被证明可以编码普遍的和高度随机的量子态系综。我们使用量子态$k$的概念,这些合奏的特点-设计从量子信息理论,并调查其普遍性使用的分析和数值技术相结合。特别是,我们建立了$k$ -设计自然产生的通用状态,以及与强相互作用,时间无关的哈密顿动力学的个人状态。我们的结果提供了一种新的方法来研究量子混沌,并提供了一个实用的方法来采样近似均匀随机状态,后者有广泛的应用在量子信息科学从层析成像到基准。

英文摘要:

Quantum chaos in many-body systems provides a bridge between statistical and quantum physics with strong predictive power. This framework is valuable for analyzing properties of complex quantum systems such as energy spectra and the dynamics of thermalization. While contemporary methods in quantum chaos often rely on random ensembles of quantum states and Hamiltonians, this is not reflective of most real-world systems. In this paper, we introduce a new perspective: across a wide range of examples, a single non-random quantum state is shown to encode universal and highly random quantum state ensembles. We characterize these ensembles using the notion of quantum state $k$-designs from quantum information theory and investigate their universality using a combination of analytic and numerical techniques. In particular, we establish that $k$-designs arise naturally from generic states as well as individual states associated with strongly interacting, time-independent Hamiltonian dynamics. Our results offer a new approach for studying quantum chaos and provide a practical method for sampling approximately uniformly random states; the latter has wide-ranging applications in quantum information science from tomography to benchmarking.

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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