Non-Gaussian Dephasing of an Electronic Mach-Zehnder Interferometer Coupled to "Which Path" Detector

TL;DR

This paper presents a non-perturbative theoretical model explaining how a nearby electronic channel causes non-Gaussian dephasing in an electronic Mach-Zehnder interferometer, aligning with recent experimental observations.

Contribution

It introduces a non-perturbative approach to model non-Gaussian dephasing effects from a

Findings

Model reproduces experimental interference visibility.

Dephasing strongly influenced by few electrons, indicating non-Gaussian noise.

Visibility reflects non-Gaussian shot-noise properties.

Abstract

A theoretical non-pertubative treatment is developed to explain the dephasing of electrons in the electronic Mach-Zehnder interferometer via interaction with a near-by partitioned electronic channel, which acts as a "which path" detector. The resulting formula reproduces the recant experimental behavior of the MZI interference visibility. By fitting the model to the experimental results, it is shown that the visibility is strongly influenced by merely ~3 detecting electrons, hence it reflects the Non-Gaussian properties behavior of the detector shot-noise.