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Josephson junctions as threshold detectors for full counting statistics.

J Tobiska1, Yu V Nazarov

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|September 28, 2004
PubMed
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Threshold detectors and Josephson junctions enable direct measurement of current fluctuation distributions. This method characterizes full counting statistics by analyzing escape rates in mesoscopic conductors.

Area of Science:

  • Mesoscopic physics
  • Quantum electronics

Background:

  • Current fluctuations are fundamental to understanding charge transport in nanoscale devices.
  • Direct measurement of full counting statistics (FCS) provides detailed insights into electron transport mechanisms.

Purpose of the Study:

  • To propose and validate a novel scheme for directly measuring the full distribution of current fluctuations.
  • To utilize Josephson junctions as threshold detectors for characterizing FCS.

Main Methods:

  • Employing threshold detectors to measure current fluctuations.
  • Exploiting the current dependence of the escape rate.
  • Applying the scheme to analyze FCS in tunnel, diffusive, and quasiballistic mesoscopic conductors.

Main Results:

Related Experiment Videos

  • Demonstrated a method to directly measure the full distribution of current fluctuations.
  • Successfully characterized FCS using the proposed scheme.
  • Obtained explicit results for various types of mesoscopic conductors.

Conclusions:

  • The proposed scheme offers a direct and effective way to measure FCS.
  • Josephson junctions are viable tools for this type of measurement.
  • The method is applicable to a range of mesoscopic systems.