Computer-automated tuning of semiconductor double quantum dots into the single-electron regime

TL;DR

This paper presents a computer algorithm that automates the tuning of semiconductor double quantum dots into the single-electron regime, reducing manual effort and increasing efficiency in quantum device preparation.

Contribution

The authors develop and benchmark an automated tuning algorithm for double quantum dots in GaAs heterostructures, requiring minimal prior knowledge and simplifying device calibration.

Findings

Successfully created three double quantum dots within a four-dot array

The algorithm accurately sets gate voltages for single-electron regime

Reduces user effort in quantum dot device tuning

Abstract

We report the computer-automated tuning of gate-defined semiconductor double quantum dots in GaAs heterostructures. We benchmark the algorithm by creating three double quantum dots inside a linear array of four quantum dots. The algorithm sets the correct gate voltages for all the gates to tune the double quantum dots into the single-electron regime. The algorithm only requires (1) prior knowledge of the gate design and (2) the pinch-off value of the single gate $T$ that is shared by all the quantum dots. This work significantly alleviates the user effort required to tune multiple quantum dot devices.