Asymmetric noise probed with a Josephson junction
arXiv:0901.2519 · doi:10.1103/PhysRevLett.102.067002
Abstract
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.
To be published in Physical Review Letters
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- Stochastic thermal feedback in switching measurements of superconducting nanobridge caused by overheated electrons and phonons
- Asymmetric noise-induced large fluctuations in coupled systems