Asymmetric noise probed with a Josephson junction

Details Asymmetric noise probed with a Josephson junction Asymmetric noise probed with a Josephson junction

2009-01-16

arxiv.org/abs/0901.2519v1

Physical Review Letters 102, 6 (2009) 067002

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.067002

Fluctuations of the current through a tunnel junction are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction and affects its switching out of the supercurrent branch. The experiment is carried out in a regime where switching is determined by thermal activation. The variance of the noise results in an elevated effective temperature, whereas the third cumulant, related to its asymmetric character, leads to a difference in the switching rates observed for opposite signs of the current through the tunnel junction. Measurements are compared quantitatively with recent theoretical predictions.

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