Combatting the Effects of Disorder in Quantum State Transfer

TL;DR

This paper investigates how to mitigate the impact of manufacturing imperfections on quantum state transfer by optimizing Hamiltonian choices and encoding strategies, significantly improving transfer fidelity.

Contribution

It introduces an optimized Hamiltonian selection and a localized encoding/decoding scheme that enhances quantum state transfer robustness against disorder.

Findings

Encoding in the single excitation subspace is optimal.

Encoding and decoding improve transfer performance.

Optimized Hamiltonian choice enhances robustness.

Abstract

In this paper, we examine disorder (i.e. static imperfections in manufacture) for the fixed-Hamiltonian evolution protocol of quantum state transfer. We improve the performance by optimising the choice of Hamiltonian, and by implementing an encoding/decoding procedure on small regions at either end of the chain. We find that encoding in only the single excitation subspace is optimal, and provides substantial enhancement to the operating regime of these systems.