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Security and Communication Networks

Architecture and protocols of the future European quantum key distribution network

Mehrdad Dianati, Romain Alléaume, Maurice Gagnaire, Xuemin Shen

Published Jan 1, 2008• 88 citations
Publisher

Abstract

Abstract A point‐to‐point quantum key distribution (QKD) system takes advantage of the laws of quantum physics to establish secret keys between two communicating parties. Compared to the classical methods, such as public‐key infrastructures, QKD offers unconditional security, which makes it attractive for very high security applications. However, this unprecedent level of security is mitigated by the inherent constraints of quantum communications, such as the limited rates and ranges of an individual point‐to‐point QKD link. A QKD network, which can be built by combining multiple point‐to‐point QKD devices, can alleviate the constraints and enable point‐to‐multi‐point key distribution based on QKD technology. The European project, secure communication based on quantum cryptography (SeCoQC) aims at deploying a prototype QKD network, which will be demonstrated in September 2008, by developing the architecture and the protocols, as well as the specific hardware for long‐range QKD networks. This paper discusses the important aspects of the architecture and the network layer protocols of the SeCoQC QKD network. Copyright © 2008 John Wiley & Sons, Ltd.

DOI
10.1002/sec.13

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A global Quantum Key Distribution (QKD) network, as the one developed in the European project SECOQC [1] is an infrastructure capable of realizing long-distance secret key establishment with information-theoretic security. Due to the specificity of their physical layer, the structure and the principle of operation of QKD networks will however significantly differ from the solutions adopted for “classical ” networks. The deployment of QKD networks is indeed far from being straightforward: it implies the con-ception of a network architecture connecting multiple users that may possibly be very far away from each other, all of this while QKD links are currently point-to-point only and intrinsically limited in distance. We will describe the logical architecture we have adopted for QKD networks with the SECOQC project. It is based on the original concept of maintaining a dedicated “network of secrets ” in order to distribute and manage the secret key material produced by QKD devices. We will alo present specific issues related to the development of a stack of network protocols adapted to the specific constraints of such infrastructures [2]. We have also considered QKD networks from a topology viewpoint and study analytically how cost minimization arguments impact on the optimal working points of individual QKD links [3]. We show in particular that, in the perspective of QKD networks, individual QKD links should be operated at an optimal working distance that can be significantly shorter than the maximum distance imposed by detector dark counts. We explain why such results motivate the research of new experimental compromise in practical QKD systems, and illustrate that point by considering the example of the recently developped DPSK QKD system [4].
The performances of Quantum Key Distribution (QKD) systems have notably progressed since the early experimental demonstrations and several recent works indicate that the pace of this progression is very likely to be maintained -if not increased- in the future years. In parallel to this fast progression of QKD techniques, commercial products are also being developed, making QKD deployment for securization of some specific “real” data networks more and more likely to occur. It is the goal to the European project Secoqc to deploy a secure long-distance network based on quantum cryptography. It implies the conception of a specific architecture able to connect multiple users that may possibly be very far away from each other while QKD links are currently ″point-to-point only″and intrinsically limited in distance.
Quantum key distribution (QKD) is a cryptographic primitive, which offers an extremely high security standard known as unconditional or information-theoretic security, relying on intrinsically quantum properties of communication (light) signals. A general trusted relay technique was adopted and developed by the Integrated EU-project SECOQC. What makes the SECOQC approach unique is on the one hand the introduction of an integrated network design, specifically tailored for the distribution of secrets, which is logically completely independent from the communication network employed by the corresponding security application layer. On the other hand, from a structural design point of view, there is a clear system separation into two basic components: a quantum key generation one, realized by a QKD link, i.e. a pair of QKD devices connected by quantum channel, and a classical secret maintenance and distribution one, realized by a dedicated "node device" with a universal interface between these two components. The main deliverable of SECOQC is the implementation and operation of a test network in Vienna and lower Austria. The paper focuses on the design approach developed in SECOQC and the implementation status of the prototype.
ABSTRACT Quantum cryptography has increasingly attracted interest from both industry and academia for its potential in real‐world applications. With advancements in quantum electronics, practical quantum devices are now commercially available and poised for broader adoption. Quantum key distribution (QKD) leverages fundamental principles of quantum mechanics to ensure secure communication, whereas quantum key distribution networks (QKDN) serve as the foundational infrastructure for deploying and scaling these secure systems. This paper examines the design methodologies specific to QKD within QKDN, emphasising both the conceptual framework and the practical challenges inherent in the field. In the pursuit of developing robust QKDN design, several key obstacles, related to the foundational QKD technology, must be addressed. These include decoherence, which affects the stability of quantum states and reduces key generation rates; latency, which disrupts synchronisation throughout the QKD network; and intrinsic quantum noise, an inherent property of quantum systems that primarily limits the overall performance of the QKD network. In addition, the limited communication ranges and the requirement for highly specialised hardware complicate the practical deployment of these networks. This work serves as an introductory guide for researchers entering the field, providing an overview of the fundamental principles of QKD network design and the distinctive routing characteristics inherent to such systems. It outlines the essential steps and considerations for building efficient and resilient QKDN infrastructures, including a discussion of the foundational principles, protocols and existing challenges.