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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.10868 |
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| _version_ | 1866913866440507392 |
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| author | Lu, Yi-Fei Wang, Yang Zhou, Yan-Yang Zhou, Yu Jiang, Xiao-Lei Li, Xin-Hang Wang, Hai-Tao Li, Jia-Ji Zhou, Chun Li, Hong-Wei Guo, Yu-Yao Zhou, Lin-Jie Bao, Wan-Su |
| author_facet | Lu, Yi-Fei Wang, Yang Zhou, Yan-Yang Zhou, Yu Jiang, Xiao-Lei Li, Xin-Hang Wang, Hai-Tao Li, Jia-Ji Zhou, Chun Li, Hong-Wei Guo, Yu-Yao Zhou, Lin-Jie Bao, Wan-Su |
| contents | Mode-pairing quantum key distribution (MP-QKD) is advantageous for long-distance secure communication, leveraging its simple implementation and quadratic scaling capacity. The post-measurement pairing in MP-QKD alleviates the photon-coincidence demands, which is essential for surpassing the fundamental limit to the key-rate transmission. In this work, we propose an improved decoy-state MP-QKD protocol featuring a flexible and efficient pairing strategy. We prove the security of the proposed scheme by presenting an entanglement model for decoy-state MP-QKD. The simulation results show that the secret key rate (SKR) can be enhanced among all distances. Notably, compared with the original scheme [Nature Communication 13, 3903 (2022)], the improvement of SKR is greater than 65\% within 375 km in the asymptotic case and greater than 50\% within 400 km in the finite case. And the achievable distance can be extended in the finite case, especially with a small block length. The simulation results demonstrate the high efficiency of the proposed scheme, which is expected to promote the practical applicability of MP-QKD. Furthermore, the entanglement model could provide a theoretical framework for further security and performance analysis of decoy-state MP-QKD. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10868 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Security Analysis of Mode-Pairing Quantum Key Distribution with Flexible Pairing Strategy Lu, Yi-Fei Wang, Yang Zhou, Yan-Yang Zhou, Yu Jiang, Xiao-Lei Li, Xin-Hang Wang, Hai-Tao Li, Jia-Ji Zhou, Chun Li, Hong-Wei Guo, Yu-Yao Zhou, Lin-Jie Bao, Wan-Su Quantum Physics Mode-pairing quantum key distribution (MP-QKD) is advantageous for long-distance secure communication, leveraging its simple implementation and quadratic scaling capacity. The post-measurement pairing in MP-QKD alleviates the photon-coincidence demands, which is essential for surpassing the fundamental limit to the key-rate transmission. In this work, we propose an improved decoy-state MP-QKD protocol featuring a flexible and efficient pairing strategy. We prove the security of the proposed scheme by presenting an entanglement model for decoy-state MP-QKD. The simulation results show that the secret key rate (SKR) can be enhanced among all distances. Notably, compared with the original scheme [Nature Communication 13, 3903 (2022)], the improvement of SKR is greater than 65\% within 375 km in the asymptotic case and greater than 50\% within 400 km in the finite case. And the achievable distance can be extended in the finite case, especially with a small block length. The simulation results demonstrate the high efficiency of the proposed scheme, which is expected to promote the practical applicability of MP-QKD. Furthermore, the entanglement model could provide a theoretical framework for further security and performance analysis of decoy-state MP-QKD. |
| title | Security Analysis of Mode-Pairing Quantum Key Distribution with Flexible Pairing Strategy |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2505.10868 |