Tunable Noise Cross-Correlations in a Double Quantum Dot

TL;DR

This paper investigates how the cross-correlation of current noise in two capacitively coupled quantum dots can be tuned by external parameters, revealing insights into quantum dot interactions.

Contribution

It demonstrates tunable noise cross-correlations in double quantum dots and validates a sequential tunneling model with capacitive coupling.

Findings

Cross-spectral density sign is tunable via gate voltage and bias.

Good agreement with a sequential tunneling model.

Provides experimental evidence of controllable noise correlations.

Abstract

We report measurements of the cross-correlation between current noise fluctuations in two capacitively coupled quantum dots in the Coulomb blockade regime. The sign of the cross-spectral density is found to be tunable by gate voltage and source-drain bias. Good agreement is found with a model of sequential tunneling through the dots in the presence of inter-dot capacitive coupling.