Emergent Quantum State Designs from Individual Many-Body Wave Functions
Emergent Quantum State Designs from Individual Many-Body Wave Functions
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来自个体多体波函数的涌现量子态设计
DOI:
10.1103/prxquantum.4.010311
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发表时间:
2023
期刊:
影响因子:
9.7
通讯作者:
Choi, Soonwon
中科院分区:
文献类型:
--
作者:
Cotler, Jordan S.;Mark, Daniel K.;Huang, Hsin-Yuan;Hernández, Felipe;Choi, Joonhee;Shaw, Adam L.;Endres, Manuel;Choi, Soonwon
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 nonrandom quantum state is shown to encode universal and highly random quantum state ensembles. We characterize these ensembles using the notion of quantum state-designs from quantum information theory and investigate their universality using a combination of analytic and numerical techniques. In particular, we establish that-designs emerge naturally from generic states in a Hilbert space as well as physical states associated with strongly interacting 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.
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