Combatting the Effects of Disorder in Quantum State Transfer

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.