Skyrmion Qubits: A New Class of Quantum Logic Elements Based on Nanoscale Magnetization

TL;DR

This paper proposes a novel quantum computing element called skyrmion qubits, which utilize nanoscale magnetic textures to store and manipulate quantum information with high controllability and scalability.

Contribution

It introduces the concept of skyrmion qubits, detailing their operation, variants, control methods, and potential for scalable quantum architectures.

Findings

Skyrmion qubits can be controlled via electric and magnetic fields.

Proposed microwave pulse schemes enable single-qubit gates.

Skyrmion multiqubit architectures are feasible for scalable quantum computing.

Abstract

We introduce a new class of primitive building blocks for realizing quantum logic elements based on nanoscale magnetization textures called skyrmions. In a skyrmion qubit, information is stored in the quantum degree of helicity, and the logical states can be adjusted by electric and magnetic fields, offering a rich operation regime with high anharmonicity. By exploring a large parameter space, we propose two skyrmion qubit variants depending on their quantized state. We discuss appropriate microwave pulses required to generate single-qubit gates for quantum computing, and skyrmion multiqubit schemes for a scalable architecture with tailored couplings. Scalability, controllability by microwave fields, operation time scales, and readout by nonvolatile techniques converge to make the skyrmion qubit highly attractive as a logical element of a quantum processor.