Analytical Methods for High-Rate Global Quantum Networks

Harney, Cillian; Pirandola, Stefano

doi:10.1103/prxquantum.3.010349

Cited by 15 publications

(24 citation statements)

References 31 publications

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“…This is illustrated in Figure 3. Further studies have shown the utility of satellite‐based QKD with respect to global quantum networks on the ground, even when the more powerful strategy of multi‐path routing is used [41].…”

Section: Applicationsmentioning

confidence: 99%

“…Recent works have established a path towards practical realisation and readiness, by requiring a networked infrastructure of dedicated quantum technologies to upscale capabilities. The essential resource in networked quantum technologies is quantum entanglement, which can be distributed directly [25–28] or through swapping [3, 29] and purification [30, 31] operations across an arbitrary topology of quantum nodes [32–41]. Heuristically, two attributes of quantum entanglement motivate a networked approach to quantum technologies.…”

Section: Introductionmentioning

confidence: 99%

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Advances in space quantum communications

Sidhu

Joshi

Gündoğan

et al. 2021

IET Quantum Communication

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153

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Concerted efforts are underway to establish an infrastructure for a global quantum Internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of space segments to overcome range limitations of purely terrestrial networks. Rapid progress in the design of quantum devices have enabled their deployment in space for in-orbit demonstrations. We review developments in this emerging area of space-based quantum technologies and provide a roadmap of key milestones towards a complete, global quantum networked landscape. Small satellites hold increasing promise to provide a cost effective coverage required to realise the quantum Internet. The state of art in small satellite missions is reviewed and the most current in-field demonstrations of quantum cryptography are collated. The important challenges in space quantum technologies that must be overcome and recent efforts to mitigate their effects are summarised. A perspective on future developments that would improve the performance of space quantum communications is included. The authors conclude with a discussion on fundamental physics experiments that could take advantage of a global, space-based quantum network.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in space quantum communications

Sidhu

Joshi

Gündoğan

et al. 2021

IET Quantum Communication

Self Cite

153

View full text Add to dashboard Cite

show abstract

“…Recently proposed in Ref. [19], we make use of weakly-regular (WR) architectures. Weakly-regular networks (WRNs) are capable of modelling large-scale, highly-connected quantum networks with a good degree of spatial and topological freedom; all the while permitting analytical derivations of optimal end-to-end rates and critical network properties that contribute to high performance.…”

Section: Weakly-regular Quantum Networkmentioning

confidence: 99%

“…For more details on the complete characterisation of WRNs, we refer the reader to the Supplementary Material of Ref. [19].…”

Section: Weakly-regular Quantum Networkmentioning

confidence: 99%

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End-to-end capacities of imperfect-repeater quantum networks

Harney

Pirandola

2022

Quantum Sci. Technol.

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The optimal performance of a communication network is limited not only by the quality of point-to-point channels but by the efficacy of its constituent technologies. Understanding the limits of quantum networks requires an understanding of both the ultimate capacities of quantum channels and the efficiency of imperfect quantum repeaters. In this work, using a recently developed node-splitting technique that introduces internal losses and noise into repeater devices, we present achievable end-to-end rates for noisy-repeater quantum networks. These are obtained by extending the coherent and reverse coherent information (single channel capacity lower bounds) into end-to-end capacity lower bounds, both in the context of single-path and multi-path routing. These achievable rates are completely general and apply to networks composed of arbitrary channels arranged in general topologies. Through this general formalism, we show how tight upper-bounds can also be derived by supplementing appropriate single-edge capacity bounds. As a result, we develop tools that provide tight performance bounds for quantum networks constituent of channels whose capacities are not exactly known and reveal critical network properties which are necessary for high-rate quantum communications. This permits the investigation of pertinent classes of quantum networks with realistic technologies; qubit amplitude damping networks and bosonic thermal-loss networks.

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Statistical properties and repetition rates for a quantum network with geographical distribution of nodes

Oliveira,

Bernardes

et al. 2024

Physics Letters A

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Analytical Methods for High-Rate Global Quantum Networks

Cited by 15 publications

References 31 publications

Advances in space quantum communications

Advances in space quantum communications

End-to-end capacities of imperfect-repeater quantum networks

Statistical properties and repetition rates for a quantum network with geographical distribution of nodes

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