End-to-End Capacities of Hybrid Quantum Networks
arXiv:2207.05482 · doi:10.1103/PhysRevApplied.18.014012
Abstract
Future quantum networks will be hybrid structures, constructed from complex architectures of quantum repeaters interconnected by quantum channels that describe a variety of physical domains; predominantly optical-fiber and free-space links. In this hybrid setting, the interplay between the channel quality within network sub-structures must be carefully considered, and is pivotal for ensuring high-rate end-to-end quantum communication. In this work, we combine recent advances in the theory of point-to-point free-space channel capacities and end-to-end quantum network capacities in order to develop critical tools for the study of hybrid, free-space quantum networks. We present a general formalism for studying the capacities of arbitrary, hybrid quantum networks, before specifying to the regime of atmospheric and space-based quantum channels. We then introduce a class of modular quantum network architectures which offer a realistic and readily analysable framework for hybrid quantum networks. By considering a physically motivated, highly connected modular structure we are able to idealize network performance and derive channel conditions for which optimal performance is guaranteed. This allows us to reveal vital properties for which distance-independent rates are achieved, so that the end-to-end capacity has no dependence on the physical separation between users. Our analytical method elucidates key infrastructure demands for a future satellite-based global quantum internet, and for hybrid wired/wireless metropolitan quantum networks.
arXiv commentSubmitted to PRApplied 13/9/21. Published 7/7/22. REVTeX, 35 pages, 8 figures
References in corpus (23)
- The Quantum Internet
- Gaussian Quantum Information
- Advances in Quantum Cryptography
- General Benchmarks for Quantum Repeaters
- Fundamental Limits of Repeaterless Quantum Communications
- Ground-to-satellite quantum teleportation
- Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
- Fault-tolerant Quantum Communication with Minimal Physical Requirements
- End-to-end capacities of a quantum communication network
- Advances in Space Quantum Communications
- Direct and Reverse Secret-Key Capacities of a Quantum Channel
- One-way quantum repeater based on near-deterministic photon-emitter interfaces
- Limits and Security of Free-Space Quantum Communications
- Satellite Quantum Communications: Fundamental Bounds and Practical Security
- Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
- Reverse Coherent Information
- Continuous-variable quantum key distribution in fast fading channels
- Quantum communication capacity transition of complex quantum networks
- Analytical Methods for High-Rate Global Quantum Networks
- Scalable authentication and optimal flooding in a quantum network
- Conditional channel simulation
- Quantum Internet under random breakdowns and intentional attacks
- Two transitions in spatial modular networks