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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Discrete Fluctuations in Memory Erasure without Energy Cost.

Toshio Croucher1, Salil Bedkihal1, Joan A Vaccaro1

  • 1Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.

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|February 25, 2017
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Researchers explored information erasure, finding that spin angular momentum, not energy, can be the cost. Discrete fluctuations in this cost were analyzed, revealing a trade-off and implications for novel, energy-free heat engines.

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Area of Science:

  • Thermodynamics
  • Information Theory
  • Quantum Mechanics

Background:

  • Landauer's principle states information erasure has an energy cost.
  • Vaccaro and Barnett (VB) proposed information erasure with only spin angular momentum cost for spin reservoirs.
  • This VB erasure involves discrete degrees of freedom, unlike Landauer's continuous energy cost.

Purpose of the Study:

  • Investigate discrete fluctuations in the VB information erasure cost.
  • Analyze the probability of violating the VB bound.
  • Derive a Jarzynski-like equality for the VB erasure protocol.

Main Methods:

  • Studied discrete fluctuations in spin angular momentum cost.
  • Obtained a Jarzynski-like equality for VB erasure.
  • Analyzed fluctuation suppression rates and trade-offs.

Main Results:

  • Fluctuations below the VB bound are suppressed more effectively than in standard Jarzynski expressions.
  • A trade-off exists between fluctuation magnitude and erasure cost.
  • Discrete fluctuation effects are prominent in maximally polarized spin reservoirs.

Conclusions:

  • The VB erasure protocol offers a pathway for information erasure without energy cost.
  • This research has implications for developing novel heat engines.
  • First laws of thermodynamics for spin angular momentum conservation in this protocol were established.