Energy-Resolved Information Scrambling in Energy-Space Lattices

• Published in: Physical review letters Vol. 126; no. 7; p. 070601
• Main Authors: Pegahan, S, Arakelyan, I, Thomas, J E
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 19-02-2021; American Physical Society (APS)
• Subjects: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Coherence; cold atoms; Correlation analysis; Crystal lattices; Energy; Fermi gases; matter waves; Quantum theory
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.126.070601

Weakly interacting Fermi gases simulate spin lattices in energy space, offering a rich platform for investigating information spreading and spin coherence in a large many-body quantum system. We show that the collective spin vector can be determined as a function of energy from the measured spin density, enabling general energy-space resolved protocols. We measure an out-of-time-order correlation function in this system and observe the energy dependence of the many-body coherence.