Measuring Non-Gaussian Fluctuations through Incoherent Cooper-Pair Current

Tero T. Heikkilä, Pauli Virtanen, Göran Johansson, and Frank K. Wilhelm
Phys. Rev. Lett. 93, 247005 – Published 8 December 2004

Abstract

We study a Josephson junction (JJ) in the regime of incoherent Cooper-pair tunneling, capacitively coupled to a nonequilibrium noise source. The current-voltage (IV) characteristics of the JJ are sensitive to the excess voltage fluctuations in the source, and can thus be used for wideband noise detection. Under weak driving, the odd part of the IV can be related to the second cumulant of noise, whereas the even part is due to the third cumulant. After calibration, one can measure the Fano factors for the noise source, and get information about the frequency dependence of the noise.

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  • Received 3 September 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.247005

©2004 American Physical Society

Authors & Affiliations

Tero T. Heikkilä1,2,*, Pauli Virtanen1, Göran Johansson3,4, and Frank K. Wilhelm5

  • 1Low Temperature Laboratory, P.O. Box 2200, FIN-02015 HUT, Finland
  • 2Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 3Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 4Applied Quantum Physics, MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden
  • 5Physics Department and CeNS, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany

  • *Electronic address: Tero.T.Heikkila@hut.fi

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Issue

Vol. 93, Iss. 24 — 10 December 2004

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