Josephson-based Threshold Detector for Lévy-Distributed Current Fluctuations

Claudio Guarcello; Davide Valenti; Bernardo Spagnolo; Vincenzo Pierro; Giovanni Filatrella

doi:10.1103/PhysRevApplied.11.044078

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Josephson-based Threshold Detector for Lévy-Distributed Current Fluctuations

Claudio Guarcello, Davide Valenti, Bernardo Spagnolo, Vincenzo Pierro, Giovanni Filatrella

DOI 10.1103/PhysRevApplied.11.044078 · Physical Review Applied

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Abstract

We propose a threshold detector for Lévy-distributed fluctuations based on a Josephson junction. The Lévy-noise current added to a linearly ramped bias current results in clear changes in the distribution of switching currents out of the zero-voltage state of the junction. We observe that the analysis of the cumulative distribution function of the switching currents supplies information on both the characteristics’ shape parameter α of the Lévy statistics. Moreover, we discuss a theoretical model, which allows characteristic features of the Lévy fluctuations to be extracted from a measured distribution of switching currents. In view of these results, this system can effectively find an application as a detector for a Lévy signal embedded in a noisy background.