Mesoscopic versus Macroscopic division of current fluctuations

TL;DR

This paper compares current shot noise behavior in mesoscopic and macroscopic nodes, predicting a transition from negative to positive correlations as the system shifts from quantum to classical regimes.

Contribution

It provides theoretical predictions for the crossover in current noise correlations between quantum coherent and macroscopic nodes, enabling experimental exploration.

Findings

Quantum coherent nodes exhibit negative current correlations.

Macroscopic nodes show positive current correlations.

The paper predicts a measurable crossover between these regimes.

Abstract

We investigate the current shot noise at a three terminal node in which one of the branches contains a noise generating source and the correlations are measured between the currents flowing through the other two branches. Interestingly, if the node is macroscopic, the current correlations are positive, whereas for a quantum coherent mesoscopic node anti-bunching of electrons leads to negative correlations. We present specific predictions which permit the experimental investigation of the crossover from quantum mechanical noise division to macroscopic noise noise division.