Detection and control of charge states in a quintuple quantum dot

TL;DR

This paper demonstrates a scalable five-quantum-dot system with charge sensors and a reservoir, confirming charge state control and modeling, advancing toward large-scale quantum dot architectures.

Contribution

It introduces a quintuple quantum dot design with integrated charge sensors and reservoir contact, validated by measurements and a capacitance model, for scalable quantum computing architectures.

Findings

Successful fabrication of a quintuple quantum dot system

Charge states confirmed by measurements and sensors

Capacitance model accurately reproduces gate performance

Abstract

A semiconductor quintuple quantum dot with two charge sensors and an additional contact to the center dot from an electron reservoir is fabricated to demonstrate the concept of scalable architecture. This design enables formation of the five dots as confirmed by measurements of the charge states of the three nearest dots to the respective charge sensor. The gate performance of the measured stability diagram is well reproduced by a capacitance model.These results provide an important step towards realizing controllable large scale multiple quantum dot systems.