High-speed quantum networking by ship

TL;DR

This paper proposes using error-corrected quantum memories in cargo ships to enable high-bandwidth, low-latency global quantum networks, offering an alternative to traditional repeater-based systems.

Contribution

It introduces a novel approach of deploying quantum memories on ships for global quantum networking, bypassing technological limitations of conventional repeaters.

Findings

Quantum memories in cargo ships can facilitate global quantum links.

Technology with sufficient fidelity for topological error correction is feasible.

Bandwidth can be improved with advancements in fabrication.

Abstract

Networked entanglement is an essential component for a plethora of quantum computation and communication protocols. Direct transmission of quantum signals over long distances is prevented by fibre attenuation and the no-cloning theorem, motivating the development of quantum repeaters, designed to purify entanglement, extending its range. Quantum repeaters have been demonstrated over short distances, but error-corrected, global repeater networks with high bandwidth require new technology. Here we show that error corrected quantum memories installed in cargo containers and carried by ship can provide a flexible connection between local networks, enabling low-latency, high-fidelity quantum communication across global distances at higher bandwidths than previously proposed. With demonstrations of technology with sufficient fidelity to enable topological error-correction, implementation of the quantum memories is within reach, and bandwidth increases with improvements in fabrication. Our approach to quantum networking avoids technological restrictions of repeater deployment, providing an alternate path to a worldwide Quantum Internet.