Influence of dephasing on shot noise in an electronic Mach-Zehnder interferometer

TL;DR

This paper analyzes how dephasing from classical field fluctuations affects shot noise in an electronic Mach-Zehnder interferometer, modifying the standard partition noise expression based on environmental fluctuation spectra.

Contribution

It provides a general theoretical framework for understanding dephasing effects on shot noise in interferometers, extending previous models.

Findings

Dephasing alters the standard shot noise expression T(1-T).

The modification depends on the power spectrum of environmental fluctuations.

The analysis applies to experimentally relevant conditions.

Abstract

We present a general analysis of shot noise in an electronic Mach-Zehnder interferometer, of the type investigated experimentally [Yang Ji et al., Nature 422, 415 (2003)], under the influence of dephasing produced by fluctuations of a classical field. We show how the usual partition noise expression T(1-T) is modified by dephasing, depending on the power spectrum of the environmental fluctuations.