Correlated Counting of Single Electrons in a Nanowire Double Quantum Dot

TL;DR

This paper demonstrates real-time detection of individual electrons in an InAs nanowire double quantum dot using quantum point contacts, enabling detailed analysis of electron tunneling processes.

Contribution

It introduces a method for correlated real-time electron counting in a nanowire double quantum dot with highly sensitive charge detection.

Findings

All tunnel rates of electrons are measured simultaneously.

Correlated signals reveal detailed tunneling dynamics.

The technique enhances understanding of quantum dot charge states.

Abstract

We report on correlated real-time detection of individual electrons in an InAs nanowire double quantum dot. Two self-aligned quantum point contacts in an underlying two-dimensional electron gas material serve as highly sensitive charge detectors for the double quantum dot. Tunnel processes of individual electrons and all tunnel rates are determined by simultaneous measurements of the correlated signals of the quantum point contacts.