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Special Issue:
SPECIAL TOPIC — Quantum communication and quantum network
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| SPECIAL TOPIC — Quantum communication and quantum network |
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Mode-pairing quantum key distribution with multi-step advantage distillation |
| Shizhuo Li(李世卓)1, Xin Liu(刘馨)1, Zhenrong Zhang(张振荣)2, and Kejin Wei(韦克金)1,† |
1 Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning 530004, China;
2 Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer Electronics and Information, Guangxi University, Nanning 530004, China |
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Abstract The advantage distillation (AD) technology has been proven to effectively improve the secret key rate and the communication distance of quantum key distribution (QKD). The mode-pairing quantum key distribution (MP-QKD) protocol can overcome a fundamental physical limit, known as the Pirandola-Laurenza-Ottaviani-Banchi bound, without requiring global phase-locking. In this work, we propose a method based on multi-step AD to further enhance the performance of MP-QKD. The simulation results show that, compared to one-step AD, multi-step AD achieves better performance in long-distance scenarios and can tolerate a higher quantum bit error rate. Specifically, when the difference between the communication distances from Alice and Bob to Charlie is 25 km, 50 km and 75 km, and the corresponding transmission distance exceeds 523 km, 512 km and 496 km, respectively, the secret key rate achieved by multi-step AD surpasses that of one-step AD. Our findings indicate that the proposed method can effectively promote the application of MP-QKD in scenarios with high loss and high error rate.
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Received: 09 June 2025
Revised: 17 July 2025
Accepted manuscript online: 28 July 2025
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PACS:
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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03.67.-a
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(Quantum information)
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| Fund: This study was supported by the National Natural Science Foundation of China (Grant Nos. 62171144 and 62031024), Guangxi Science Foundation (Grant Nos. 2025GXNSFAA069137 and GXR-1BGQ2424005), and Innovation Project of Guangxi Graduate Education (Grant No. YCBZ2025064). |
Corresponding Authors:
Kejin Wei
E-mail: kjwei@gxu.edu.cn
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Cite this article:
Shizhuo Li(李世卓), Xin Liu(刘馨), Zhenrong Zhang(张振荣), and Kejin Wei(韦克金) Mode-pairing quantum key distribution with multi-step advantage distillation 2025 Chin. Phys. B 34 090307
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