Wide-band detection of the third moment of shot noise by a hysteretic Josephson junction

TL;DR

This paper demonstrates the use of a hysteretic Josephson junction as an on-chip detector for the third moment of shot noise, with a bandwidth around 50 GHz, revealing asymmetries in switching rates due to shot noise characteristics.

Contribution

It introduces a novel method for detecting the third moment of shot noise using a Josephson junction with a high bandwidth, advancing noise measurement techniques.

Findings

Detection of third moment via switching rate asymmetry

Bandwidth limited by plasma frequency (~50 GHz)

Adiabatic response assumption validated

Abstract

We use a hysteretic Josephson junction as an on-chip detector of the third moment of shot noise of a tunnel junction. The detectable bandwidth is determined by the plasma frequency of the detector, which is about 50 GHz in the present experiment. The third moment of shot noise results in a measurable change of the switching rate when reversing polarity of the current through the noise source. We analyze the observed asymmetry assuming adiabatic response of the detector.