Guided magnon transport in spin chains: transport speed and correcting for disorder

TL;DR

This paper explores how to optimize magnon transport in spin chains using varying magnetic potentials, analyzing the impact of potential shape and disorder, and proposing practical implementations for high-fidelity quantum information transfer.

Contribution

It introduces a method to enhance magnon transport fidelity and speed in spin chains by shaping magnetic potentials and mitigating disorder effects, with practical implementation strategies.

Findings

Potential shape significantly affects transport fidelity and speed.

Disorder can be minimized to improve transport robustness.

Practical implementation schemes are proposed for accessible systems.

Abstract

High fidelity quantum information transport is necessary for most practical models of quantum computation. By analogy with optical wave guides, a spatio-temporally varying magnetic potential on a one dimensional spin chain can achieve high fidelity transport of spin excitations. By comparing different potential shapes, we establish the effects of potential shape on the fidelity and transport speed. We incorporate disorder into our model and show methods to minimise its effect on transport. Finally, we discuss implementations of our scheme in several accessible systems based on hydrogenic approximations.