Improving reproducibility of quantum devices with completely undoped architectures

TL;DR

This paper demonstrates that using completely undoped heterostructures significantly enhances the reproducibility and uniformity of quantum electronic devices compared to traditional modulation doped structures, benefiting quantum technology manufacturing.

Contribution

The study introduces a fully undoped heterostructure architecture that improves reproducibility and uniformity in quantum device fabrication, surpassing modulation doping methods.

Findings

Undoped heterostructures show superior reproducibility.

More consistent operating voltages are achieved.

Enhanced uniformity in confinement potential.

Abstract

The reproducible operation of quantum electronic devices is a key requirement for future quantum information processing and spintronics applications. Traditionally quantum devices have been fabricated from modulation doped heterostructures, where there is an intrinsic lack of reproducibility due to the random potential from ionized donors. Here we show that we can greatly improve reproducibility over modulation doped devices by using a completely undoped architecture, with superior uniformity in the confinement potential and more consistent operating voltages for both electron and hole devices. Our results demonstrate that undoped heterostructures have significant advantages over modulation doping for reproducible manufacturing of quantum devices.