Scalable twin-field quantum key distribution network enabled by adaptable architecture
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909624469291008 |
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| author | Huang, Chunfeng Guan, Rui Liu, Xin He, Wenjie Li, Shizhuo Liang, Hao Luo, Ziyang Zhang, Zhenrong Li, Wei Wei, Kejin |
| author_facet | Huang, Chunfeng Guan, Rui Liu, Xin He, Wenjie Li, Shizhuo Liang, Hao Luo, Ziyang Zhang, Zhenrong Li, Wei Wei, Kejin |
| contents | Quantum key distribution (QKD) is a key application in quantum communication, enabling secure key exchange between parties using quantum states. Twin-field (TF) QKD offers a promising solution that surpasses the repeaterless limits, and its measurement-device-independent nature makes it suitable for star-type network architectures. In this work, we propose a scalable TF-QKD network with adaptable architecture, where users prepare quantum signals and send them to network nodes. These nodes use an optical switch to route the signals to multi-user measurement units, enabling secure key distribution among arbitrary users and adapting to complex connection demands of the network. A proof-of-principle demonstration with three users successfully achieved secure key sharing over simulated link losses of up to $30$ dB, with an average rate of $19.57$ bit/s. Additionally, simulations show that the proposed architecture can achieve a total secure key rate of $4.84 \times 10^{4}$ bit/s at $100$ km in a symmetric $32$-user network. This approach represents a significant advancement in the topology of untrusted-node QKD networks and holds promise for practical, large-scale applications in secure communication. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15137 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Scalable twin-field quantum key distribution network enabled by adaptable architecture Huang, Chunfeng Guan, Rui Liu, Xin He, Wenjie Li, Shizhuo Liang, Hao Luo, Ziyang Zhang, Zhenrong Li, Wei Wei, Kejin Quantum Physics Quantum key distribution (QKD) is a key application in quantum communication, enabling secure key exchange between parties using quantum states. Twin-field (TF) QKD offers a promising solution that surpasses the repeaterless limits, and its measurement-device-independent nature makes it suitable for star-type network architectures. In this work, we propose a scalable TF-QKD network with adaptable architecture, where users prepare quantum signals and send them to network nodes. These nodes use an optical switch to route the signals to multi-user measurement units, enabling secure key distribution among arbitrary users and adapting to complex connection demands of the network. A proof-of-principle demonstration with three users successfully achieved secure key sharing over simulated link losses of up to $30$ dB, with an average rate of $19.57$ bit/s. Additionally, simulations show that the proposed architecture can achieve a total secure key rate of $4.84 \times 10^{4}$ bit/s at $100$ km in a symmetric $32$-user network. This approach represents a significant advancement in the topology of untrusted-node QKD networks and holds promise for practical, large-scale applications in secure communication. |
| title | Scalable twin-field quantum key distribution network enabled by adaptable architecture |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2504.15137 |