Analytical Methods for High-Rate Global Quantum Networks

Abstract

The development of a future, global quantum communication network (or quantum internet) will enable high rate private communication and entanglement distribution over very long distances. However, the large-scale performance of ground-based quantum networks (which employ photons as information carriers through optical-fibres) is fundamentally limited by fibre quality and link length, with the latter being a primary design factor for practical network architectures. While these fundamental limits are well established for arbitrary network topologies, the question of how to best design global architectures remains open. In this work, we introduce a large-scale quantum network model called weakly-regular architectures. Such networks are capable of idealising network connectivity, provide freedom to capture a broad class of spatial topologies and remain analytically treatable. This allows us to investigate the effectiveness of large-scale networks with consistent connective properties, and unveil critical conditions under which end-to-end rates remain optimal. Furthermore, through a strict performance comparison of ideal, ground-based quantum networks with that of realistic satellite quantum communication protocols, we establish conditions for which satellites can be used to outperform fibre-based quantum infrastructure; {rigorously proving the efficacy of satellite-based technologies for global quantum communications.

Revised Version. Main text: 11 pages, 3 figures; Supplementary Mat. 19 pages, 4 figures

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• Practical Routing and Criticality in Large-Scale Quantum Communication Networks
• Continuously Distributing Entanglement in Quantum Networks with Regular Topologies
• Realistic Threat Models for Fiber and Free-Space Continuous-Variable Quantum Key Distribution
• Optimal Interpolation of Entanglement Purification Protocols