Noise enhancement due to quantum coherence in coupled quantum dots

TL;DR

This paper explains how quantum coherence and Coulomb blockade cause noise enhancement in coupled quantum dots, highlighting the sensitivity of this effect to decoherence from electron-phonon interactions.

Contribution

It introduces a novel mechanism for super-Poissonian charge transfer driven by quantum coherence in coupled quantum dots.

Findings

Noise enhancement explained by quantum coherence and Coulomb blockade

Super-Poissonian charge transfer is sensitive to decoherence

Temperature dependence indicates electron-phonon scattering effects

Abstract

We show that the intriguing observation of noise enhancement in the charge transport through two vertically coupled quantum dots can be explained by the interplay of quantum coherence and strong Coulomb blockade. We demonstrate that this novel mechanism for super-Poissonian charge transfer is very sensitive to decoherence caused by electron-phonon scattering as inferred from the measured temperature dependence.