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Raman phonon emission in a driven double quantum dot

Author

Listed:
  • J.I. Colless

    (ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney)

  • X.G. Croot

    (ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney)

  • T.M. Stace

    (ARC Centre of Excellence for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland)

  • A.C. Doherty

    (ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney)

  • S.D. Barrett

    (Blackett Laboratory and Institute for Mathematical Sciences, Imperial College London)

  • H. Lu

    (University of California)

  • A.C. Gossard

    (University of California)

  • D.J. Reilly

    (ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney)

Abstract

The compound semiconductor gallium–arsenide (GaAs) provides an ultra-clean platform for storing and manipulating quantum information, encoded in the charge or spin states of electrons confined in nanostructures. The absence of inversion symmetry in the zinc-blende crystal structure of GaAs however, results in a strong piezoelectric interaction between lattice acoustic phonons and qubit states with an electric dipole, a potential source of decoherence during charge-sensitive operations. Here we report phonon generation in a GaAs double quantum dot, configured as a single- or two-electron charge qubit, and driven by the application of microwaves via surface gates. In a process that is a microwave analogue of the Raman effect, phonon emission produces population inversion of the two-level system and leads to rapid decoherence of the qubit when the microwave energy exceeds the level splitting. Comparing data with a theoretical model suggests that phonon emission is a sensitive function of the device geometry.

Suggested Citation

  • J.I. Colless & X.G. Croot & T.M. Stace & A.C. Doherty & S.D. Barrett & H. Lu & A.C. Gossard & D.J. Reilly, 2014. "Raman phonon emission in a driven double quantum dot," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4716
    DOI: 10.1038/ncomms4716
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