Single electron routing in a silicon quantum-dot array

TL;DR

This paper proposes a silicon single-electron router that precisely directs electrons along a quantum dot array with over 99% accuracy, enabling advanced solid-state quantum computing schemes.

Contribution

It introduces a phase-controlled routing scheme for single electrons in a silicon quantum dot array with high accuracy and analyzes the minimum error rate using a Wigner transport model.

Findings

Routing accuracy exceeds 99% with an assist gate.

Model predicts minimal error rates in electron transport.

Demonstrates potential for fast, precise electron transport in quantum devices.

Abstract

The ability to transport single electrons on a quantum dot array dramatically increases the freedom in designing quantum computation schemes that can be implemented on solid-state devices. So far, however, routing schemes to precisely control the transport paths of single electrons have yet to be established. Here, we propose a silicon single-electron router that transports pumped electrons along the desired route on the branches of a T-shaped quantum dot array by inputting a synchronous phase-controlled signal to multiple gates. Notably, we show that it is possible to achieve a routing accuracy above 99\% by boosting the accuracy of the electron-transport timing with an assist gate in front of the branching paths. We also evaluated the minimum error rate of routing by the model of electron transport based on the Wigner representation in an energy-time space. The results suggest new possibilities for fast and accurate transport of single electrons on the two-dimensional quantum dot arrays.