Detecting charge noise with a Josephson junction: A problem of thermal escape in presence of non-Gaussian fluctuations
arXiv:cond-mat/0607020 · doi:10.1103/PhysRevLett.98.036601
Abstract
Motivated by several experimental activities to detect charge noise produced by a mesoscopic conductor with a Josephson junction as on-chip detector, the switching rate out of its zero-voltage state is studied. This process is related to the fundamental problem of thermal escape in presence of non-Gaussian fluctuations. In the relevant case of weak higher than second order cumulants, an effective Fokker-Planck equation is derived, which is then used to obtain an explicit expression for the escape rate. Specific results for the rate asymmetry due to the third moment of current noise allow to analyse experimental data and to optimize detection circuits.
arXiv comment4 pages, 1 figure; minor typos corrected, some revisions in the text
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