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Related Experiment Videos

Spontaneous emission spectrum in double quantum dot devices

Fujisawa1, Oosterkamp, van der Wiel WG

  • 1T. Fujisawa, Department of Applied Physics and DIMES, Delft University of Technology, 2600 GA Delft, Netherlands, and NTT Basic Research Laboratories, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198, Japan. T. H. Oosterkamp, W. G. van d.

Science (New York, N.Y.)
|October 30, 1998
PubMed
Summary

Researchers measured electronic transition rates in a double quantum dot. Inelastic transitions, influenced by acoustic phonons and vacuum fluctuations, impact the creation of long-lived quantum states.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Semiconductor devices

Background:

  • Double quantum dots act as tunable two-level systems for electronic states.
  • Understanding transition rates is crucial for quantum information processing.

Purpose of the Study:

  • To directly measure elastic and inelastic transition rates in a double quantum dot.
  • To investigate the role of environmental bosonic degrees of freedom, specifically acoustic phonons, in these transitions.
  • To assess the impact of vacuum fluctuations on quantum dot device performance.

Main Methods:

  • Utilized a direct measurement technique employing a direct current (dc) electron current.
  • Analyzed energy exchange during inelastic transitions between the two electronic levels.

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  • Characterized the coupling of acoustic phonons as the dominant bosonic interaction.

    • Main Results:

    • Successfully measured elastic and inelastic transition rates.
    • Demonstrated that inelastic transition rates align with predictions from Einstein coefficients (absorption, stimulated emission, spontaneous emission).
    • Identified acoustic phonons as the primary mediators of energy exchange in the semiconductor environment.

    Conclusions:

    • Vacuum fluctuations significantly influence quantum dot device behavior.
    • Environmental interactions, particularly with acoustic phonons, impose design constraints for creating long-lived quantum states.
    • The findings provide insights for designing future quantum dot-based quantum technologies.