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Characterization of quantum chaos by two-point correlation functions

Journal Article · · Physical Review. E
 [1];  [2];  [3];  [4]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States); Stanford Univ., CA (United States); OSTI
  2. Univ. of Surrey, Guildford (United Kingdom); Univ. of Southampton (United Kingdom); Brown Univ., Providence, RI (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Kyoto Univ. (Japan)
In this work, we propose a characterization of quantum many-body chaos: given a collection of simple operators, the set of all possible pair correlations between these operators can be organized into a matrix with a random-matrix-like spectrum. This approach is particularly useful for locally interacting systems, which do not generically show exponential Lyapunov growth of out-of-time-ordered correlators. We demonstrate the validity of this characterization by numerically studying the Sachdev-Ye-Kitaev model and a one-dimensional spin chain with random magnetic field (XXZ model).
Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); Science and Technology Facilities Council (STFC); Simons Foundation; USDOE Office of Science (SC)
Grant/Contract Number:
SC0017905
OSTI ID:
1803190
Journal Information:
Physical Review. E, Journal Name: Physical Review. E Journal Issue: 2 Vol. 102; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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