Emergent Prethermalization Signatures in Out-of-Time Ordered Correlations
Name
PhysRevLett.123.090605.pdf
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Checksum (MD5)
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Author(s)
Wei, Ken Xuan
Peng, Pai
Shtanko, Oles
Marvian, Iman
Lloyd, Seth
Ramanathan, Chandrasekhar
Cappellaro, Paola
Date Issued
August 30, 2019
Publisher
American Physical Society
Citation
Phys. Rev. Lett. 123, 090605 (2019)
Version
Final published version
Abstract
How a many-body quantum system thermalizes—or fails to do so—under its own interaction is a fundamental yet elusive concept. Here we demonstrate nuclear magnetic resonance observation of the emergence of prethermalization by measuring out-of-time ordered correlations. We exploit Hamiltonian engineering techniques to tune the strength of spin-spin interactions and of a transverse magnetic field in a spin chain system, as well as to invert the Hamiltonian sign to reveal out-of-time ordered correlations. At large fields, we observe an emergent conserved quantity due to prethermalization, which can be revealed by an early saturation of correlations. Our experiment not only demonstrates a new protocol to measure out-of-time ordered correlations, but also provides new insights in the study of quantum thermodynamics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.123.090605
