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Related Experiment Videos

Measuring non-Gaussian fluctuations through incoherent cooper-pair current.

Tero T Heikkilä1, Pauli Virtanen, Göran Johansson

  • 1Low Temperature Laboratory, P.O. Box 2200, FIN-02015 HUT, Finland. Tero.T.Heikkila@hut.fi

Physical Review Letters
|February 9, 2005
PubMed
Summary

This study shows Josephson junctions can detect wideband noise by analyzing their current-voltage characteristics. This method reveals noise properties like Fano factors and frequency dependence.

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Area of Science:

  • Quantum electronics
  • Condensed matter physics
  • Noise characterization

Background:

  • Josephson junctions (JJ) exhibit unique quantum phenomena.
  • Understanding nonequilibrium noise sources is crucial for quantum device applications.
  • Current-voltage (I-V) characteristics are sensitive probes of electronic transport.

Purpose of the Study:

  • To investigate the use of Josephson junctions for wideband noise detection.
  • To establish a relationship between JJ I-V characteristics and noise cumulants.
  • To demonstrate noise source characterization using JJ measurements.

Main Methods:

  • Studying a Josephson junction coupled to a nonequilibrium noise source.
  • Analyzing the current-voltage (I-V) characteristics under incoherent Cooper-pair tunneling.

Related Experiment Videos

  • Relating the odd and even parts of the I-V curve to noise cumulants (second and third).

    • Main Results:

    • JJ I-V characteristics are sensitive to voltage fluctuations from the noise source.
    • The odd part of the I-V curve correlates with the second cumulant of noise.
    • The even part of the I-V curve correlates with the third cumulant of noise.

    Conclusions:

    • Josephson junctions can serve as effective wideband noise detectors.
    • JJ measurements allow for the determination of noise source Fano factors.
    • This technique provides insights into the frequency dependence of noise properties.