Topological Spin Textures Enabling Quantum Transmission

TL;DR

This paper proposes a scalable quantum information transmission method using topological spin textures, specifically domain walls, in a hybrid magnetic racetrack architecture with localized spin qubits, enabling high-fidelity entanglement and flexible state transfer.

Contribution

It introduces a novel hybrid quantum platform combining topological spin textures with solid-state qubits for scalable quantum information processing.

Findings

Demonstrates domain walls can transport quantum signals between distant qubits.

Introduces a measurement-free protocol for high-fidelity entanglement.

Shows spin qubits can serve as quantum stations for flexible state transfer.

Abstract

Quantum spintronics is an emerging field focused on developing novel applications by utilizing the quantum coherence of magnetic systems. A key challenge in this context is achieving scalable long-range quantum information transmission in magnetic systems. Here, we propose a novel transmission scheme based on topological spin textures in a hybrid architecture combining a magnetic racetrack and localized spin qubits. We demonstrate this principle by employing the domain wall (DW), the most fundamental texture, to transport quantum signal between distant qubits. We introduce a measurement-free protocol that utilizes DW mobility to enable high-fidelity and tunable entanglement generation. Furthermore, we demonstrate that spin qubits can function as quantum stations on the racetrack, enabling flexible state transfer among fast-moving DWs on a single track. Finally, we discuss concrete material platforms to implement the proposed scheme. Our work introduces a new hybrid quantum platform that merges topological spin textures with solid-state qubits, offering a scalable architecture for quantum information processing and opening promising directions for quantum spintronics.