Electron-photon correlations and the third moment of quantum noise

TL;DR

This paper investigates electron-photon correlations in a quantum conductor, measuring the third moment of quantum shot noise across different regimes, revealing its frequency independence and deepening understanding of quantum noise properties.

Contribution

It provides the first experimental measurement of the intrinsic third moment of quantum shot noise and demonstrates its frequency independence in a tunnel junction.

Findings

Measured correlation between electromagnetic power fluctuations and electron transport.

Identified regimes where fluctuations are real photons or vacuum.

Found the third moment of quantum shot noise to be frequency independent.

Abstract

The radiation generated by a quantum conductor should be correlated with electrons crossing it. We have measured the correlation between the fluctuations of the high frequency electromagnetic power and the low frequency transport in a tunnel junction. We have explored the regimes where electromagnetic fluctuations correspond to real photons and where they correspond to vacuum at very low temperature. We deduce from our data the intrinsic third moment of quantum shot noise, which appears to be frequency independent.