Routing quantum information in spin chains

TL;DR

This paper presents two models for efficient quantum state routing in spin chains, utilizing local and global magnetic fields to achieve high fidelity transmission between sender and receiver.

Contribution

It introduces novel quantum routing protocols in spin chains using magnetic fields and coupling strategies, enhancing quantum communication efficiency.

Findings

High fidelity quantum routing achieved in both models

Weak and strong coupling strategies compared

Effective use of magnetic fields for routing

Abstract

Two different models for performing efficiently routing of a quantum state are presented. Both cases involve an XX spin chain working as data bus and additional spins that play the role of sender and receivers, one of which is selected to be the target of the quantum state transmission protocol via a coherent quantum coupling mechanism making use of local/global magnetic fields. Quantum routing is achieved, in the first of the models considered, by weakly coupling the sender and the receiver to the data bus. In the second model, strong magnetic fields acting on additional spins located between the sender/receiver and the data bus allow us to perform high fidelity routing.