首页|A cost-efficient quantum access network with qubit-based synchronization

A cost-efficient quantum access network with qubit-based synchronization

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Quantum key distribution(QKD)is a physical layer encryption technique that enables two distant parties to exchange secure keys with information-theoretic security.In the last two decades,QKD has transitioned from laboratory research to real-world ap-plications,including multi-user quantum access networks(QANs).This network structure allows users to share a single-photon detector at a network node through time-division multiplexing,thereby significantly reducing the network cost.However,cur-rent QAN implementations require additional hardware for auxiliary tasks such as time synchronization.To address this issue,we propose a cost-efficient QAN that uses qubit-based synchronization.In this approach,the transmitted qubits facilitate time synchronization,eliminating the need for additional synchronization hardware.We tested our scheme by implementing a net-work for two users and successfully achieved average secure key rates of 53.84 kbps and 71.90 kbps for each user over a 50-km commercial fiber spool.In addition,we investigated the capacity of the access network under cross-talk and loss conditions.The simulation results demonstrate that this scheme can support a QAN with 64 users with key rates up to 1070 bps.Our work provides a feasible and cost-effective way to implement a multi-user QKD network,further promoting the widespread application of QKD.

quantum key distributionquantum access networkqubit-based synchronization

Chunfeng Huang、Ye Chen、Tingting Luo、Wenjie He、Xin Liu、Zhenrong Zhang、Kejin Wei

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Guangxi Key Laboratory for Relativistic Astrophysics,School of Physical Science and Technology,Guangxi University,Nanning 530004,China

Guangxi Key Laboratory of Multimedia Communications and Network Technology,School of Computer Electronics and Information,Guangxi University,Nanning 530004,China

国家自然科学基金国家自然科学基金Guangxi Science FoundationGuangxi Science FoundationOpen Fund of Institute of Pervasive Computing(IPOC)(Beijing University of Posts and Telecommunications)Innovation Project of Guangxi Graduate Education

62171144119050652021GXNSFAA2200112021AC19384IPOC2021A02YCSW2022040

2024

10.1007/s11433-023-2302-8

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(4)
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