A Josephson junction as a detector of Poissonian charge injection

Details A Josephson junction as a detector of Poissonian charge injection A Josephson junction as a detector of Poissonian charge injection

2004-03-28

arxiv.org/abs/cond-mat/0403673v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.93.206601

We propose a scheme of measuring the non-Gaussian character of noise by a hysteretic Josephson junction in the macroscopic quantum tunnelling (MQT) regime. We model the detector as an (under)damped $LC$ resonator. It transforms Poissonian charge injection into current through the detector, which samples the injection statistics over a floating time window of length $\sim Q/\omega _{\rm J}$, where $Q$ is the quality factor of the resonator and $\omega_{\rm J}$ its resonance frequency. This scheme ought to reveal the Poisson character of charge injection in a detector with realistic parameters.

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