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Molecular Entanglement and Electrospinnability of Biopolymers
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Probing entanglement in a many-body-localized system.

Alexander Lukin1, Matthew Rispoli1, Robert Schittko1

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|April 20, 2019
PubMed
Summary
This summary is machine-generated.

Many-body localization prevents quantum systems from reaching thermal equilibrium. Researchers experimentally observed this phenomenon, confirming a distinct state of matter characterized by localized particles and growing entanglement entropy.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Statistical mechanics

Background:

  • Disordered quantum systems can fail to thermalize, indicating a breakdown of thermodynamics.
  • Understanding this phenomenon requires measuring system entanglement, which is experimentally difficult.

Purpose of the Study:

  • To experimentally realize and characterize a many-body localized system.
  • To investigate the role of entanglement in the breakdown of thermalization.

Main Methods:

  • Realization of a many-body localized system in a disordered Bose-Hubbard chain.
  • Characterization of entanglement properties via particle fluctuations and correlations.
  • Measurement of nonlocal correlations to probe entanglement entropy growth.

Main Results:

  • Observed particle localization, suppressing transport and subsystem thermalization.
  • Measured nonlocal correlations exhibiting logarithmic growth of entanglement entropy.
  • Demonstrated that many-body localization is distinct from noninteracting localization.

Conclusions:

  • Experimentally confirmed many-body localization as a distinct quantum phenomenon.
  • Established a method for characterizing entanglement in such systems.
  • Provided insights into the breakdown of thermodynamics in disordered quantum systems.