Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: TR: Poster Session

TT 36.34: Poster

Donnerstag, 25. März 2010, 14:00–18:00, Poster A

Feedback and Rate Asymmetry of the Josephson Junction Noise Detector — •Daniel Urban¹ and Hermann Grabert^1,2 — ¹Physikalisches Institut, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany — ²Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany

The Josephson junction noise detector measures the skewness of non-Gaussian noise via the asymmetry of the rate of escape from the zero-voltage state upon reversal of the bias current. The feedback of this detector on the noise generating device is investigated in detail [1]. Concise predictions are made for a second Josephson junction as noise generating device. The strong nonlinearity of this component implies particularly strong feedback effects, including a change of sign of the rate asymmetry as the applied voltage approaches twice the superconducting gap.

[1] D. F. Urban and H. Grabert, Phys. Rev. B 79, 113102 (2009).