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Emergent Prethermalization Signatures in Out-of-Time Ordered Correlations.

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Researchers observed prethermalization in quantum systems using nuclear magnetic resonance. This study reveals emergent conserved quantities and a new method for measuring out-of-time ordered correlations in quantum thermodynamics.

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Area of Science:

  • Quantum Physics
  • Thermodynamics
  • Condensed Matter Physics

Background:

  • Understanding thermalization in many-body quantum systems is a fundamental challenge.
  • Prethermalization describes a state where systems appear to equilibrate but haven't reached true thermal equilibrium.

Purpose of the Study:

  • To experimentally observe the emergence of prethermalization in a quantum system.
  • To demonstrate a novel method for measuring out-of-time ordered correlations.

Main Methods:

  • Utilized nuclear magnetic resonance (NMR) spectroscopy.
  • Employed Hamiltonian engineering to control spin-spin interactions and magnetic fields.
  • Applied Hamiltonian sign-inversion to reveal out-of-time ordered correlations.

Main Results:

  • Observed the emergence of prethermalization in a spin chain system.
  • Demonstrated an emergent conserved quantity at large magnetic fields, indicated by early correlation saturation.
  • Successfully measured out-of-time ordered correlations using the developed protocol.

Conclusions:

  • The experiment provides direct evidence of prethermalization.
  • The developed NMR protocol offers new insights into measuring quantum correlations.
  • This work advances the understanding of quantum thermodynamics and thermalization processes.