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Updated: May 30, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Generic transient memory formation in disordered systems with noise.

Nathan C Keim1, Sidney R Nagel

  • 1James Franck Institute, Department of Physics, University of Chicago, Illinois 60637, USA.

Physical Review Letters
|July 30, 2011
PubMed
Summary
This summary is machine-generated.

Disordered systems can "remember" training inputs but then "forget" them over time. Adding noise can prevent this memory loss in these complex systems.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Last Updated: May 30, 2026

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Area of Science:

  • Complex systems
  • Statistical physics
  • Non-equilibrium dynamics

Background:

  • Out-of-equilibrium disordered systems exhibit complex memory behaviors.
  • These systems can store information from external driving but often lose it over time.

Purpose of the Study:

  • To investigate the interplay between learning and forgetting in disordered systems.
  • To identify conditions under which memory loss can be prevented.

Main Methods:

  • Analysis of out-of-equilibrium disordered systems.
  • Modeling non-Brownian suspensions under cyclic shear.
  • Investigating the role of noise in memory retention.

Main Results:

  • Learning and forgetting are intrinsically linked processes in these systems.
  • Memory loss occurs even with continuous input repetition.
  • The addition of noise can effectively prevent memory loss.

Conclusions:

  • A class of systems exhibiting this memory behavior has been identified.
  • Non-Brownian suspensions under cyclic shear serve as a relevant example.
  • Noise can be a crucial factor in stabilizing memory in disordered systems.