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Related Experiment Videos

Nonadiabatic electron pumping: maximal current with minimal noise.

Michael Strass1, Peter Hänggi, Sigmund Kohler

  • 1Institut für Physik, Universität Augsburg, Germany.

Physical Review Letters
|October 4, 2005
PubMed
Summary

Researchers investigated pump current noise in a double-quantum-dot system. Optimal driving frequencies maximize current while minimizing noise power, offering insights into quantum transport control.

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Area of Science:

  • Quantum physics
  • Mesoscopic systems
  • Quantum transport

Background:

  • Understanding noise properties in quantum systems is crucial for developing quantum technologies.
  • Open quantum systems, like double quantum dots, exhibit complex transport phenomena influenced by external driving.

Purpose of the Study:

  • To investigate the noise properties of pump currents in an open double-quantum-dot system subjected to nonadiabatic AC driving.
  • To identify optimal working points for maximizing pump current and minimizing noise power.

Main Methods:

  • Utilized a rotating-wave approximation to derive analytical expressions for current and noise power.
  • Employed Floquet transport theory for numerical simulations and comparison with analytical results.

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Main Results:

  • Identified specific driving frequencies near internal resonances as optimal working points.
  • Demonstrated that at these optimal points, pump current is maximized, and noise power is minimized.
  • Analytical predictions were validated through numerical simulations.

Conclusions:

  • Nonadiabatic AC driving offers a method to control and optimize noise characteristics in double-quantum-dot systems.
  • The findings provide a pathway for designing low-noise quantum devices.