Perspective: Quantum Computing on Magnetic Racetrack

TL;DR

This paper explores the potential of magnetic domain walls as a platform for quantum computing, emphasizing their controllability, scalability, and suitability for both stationary and flying qubits.

Contribution

It provides a comprehensive overview of the current understanding, promising material platforms, and key experiments needed for quantum computation using magnetic domain walls.

Findings

Magnetic domain walls can serve as stationary and flying qubits.

High mobility of domain walls enables quantum information transfer.

Identifies challenges and opportunities at the magnetism-quantum interface.

Abstract

Magnetic domain walls have long been pursued as carriers of classical information for storage and processing. With the ability to create, control, and probe domain walls at the nanoscale, they are recently recognized as an ideal platform for studying macroscopic quantum effects and provide a natural blueprint for building scalable quantum computing architectures. In particular, the experimentally demonstrated high mobility of domain walls makes them not only suitable as stationary qubits but also as flying qubits, which may offer advantages over currently explored quantum computing platforms. In this Perspective, we outline our current understanding of the essential ingredients and key requirements for realizing universal quantum computation based on magnetic domain walls. We highlight promising concrete material platforms and identify the experiments that are still needed to advance this concept. We also discuss the potential challenges and point to new opportunities in this emerging research direction at the interface between magnetism and quantum information science.