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Quantum optical communication rates through an amplifying random medium.

J Tworzydło1, C W J Beenakker

  • 1Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands.

Physical Review Letters
|July 30, 2002
PubMed
Summary
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We investigated how stimulated and spontaneous emission affect information capacity in disordered waveguides. At laser threshold, capacity reaches a universal limit, influenced by disorder and input power.

Area of Science:

  • Optics and Photonics
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Disordered waveguides exhibit complex light propagation phenomena.
  • Amplification introduces stimulated and spontaneous emission, competing with signal loss.
  • Understanding information capacity is crucial for optical communication and quantum technologies.

Purpose of the Study:

  • To analyze the interplay between stimulated and spontaneous emission in amplifying disordered waveguides.
  • To determine the information capacity under these competing effects.
  • To identify conditions for a universal capacity limit.

Main Methods:

  • Theoretical analysis of light propagation in disordered media.
  • Modeling of amplification processes including both emission types.

Related Experiment Videos

  • Derivation of information capacity expressions for coherent states.
  • Generalization for arbitrary detection schemes.

    • Main Results:

    • A universal information capacity limit is found at the laser threshold.
    • This limit's dependence on disorder and input power is quantified.
    • Explicit expressions for heterodyne detection are derived.
    • The capacity can exceed or fall below the non-amplifying case.

    Conclusions:

    • The laser threshold provides a unique regime for information capacity in amplifying disordered systems.
    • Input power and degree of disorder are critical parameters determining capacity.
    • The findings offer insights into optimizing information transfer in complex optical systems.