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Related Experiment Videos

Full counting statistics of multiple Andreev reflection.

Göran Johansson1, Peter Samuelsson, Ake Ingerman

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany.

Physical Review Letters
|November 13, 2003
PubMed
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We analyzed charge transfer in superconducting junctions. For long measurements, charge transfer involves correlated multiple electron charges, each linked to a single quasiparticle transfer.

Area of Science:

  • Condensed Matter Physics
  • Quantum Electronics
  • Mesoscopic Physics

Background:

  • Superconducting junctions are crucial for quantum electronics.
  • Understanding charge transfer dynamics is key to advancing quantum devices.
  • Full counting statistics provide insights into electron transport.

Purpose of the Study:

  • To derive the full counting statistics of charge transfer across a voltage-biased superconducting junction.
  • To investigate the nature of charge transfer at long measurement times.

Main Methods:

  • Theoretical derivation of full counting statistics.
  • Analysis of charge transfer in the context of Josephson frequency.

Main Results:

Related Experiment Videos

  • For measurement times significantly longer than the inverse Josephson frequency, the counting statistics reveal a correlated transfer of multiple electron charge quanta.
  • Each charge quantum is fundamentally associated with the transfer of a single quasiparticle.
  • An expression for the counting statistics was derived using quasiparticle scattering amplitudes.

    • Conclusions:

    • The study elucidates the complex nature of charge transfer in superconducting junctions under specific measurement conditions.
    • The findings highlight the role of quasiparticles in correlated charge transfer events.
    • The derived expression provides a theoretical tool for further analysis in quantum transport phenomena.