Mode-pairing quantum key distribution with multi-step advantage distillation

doi:10.1088/1674-1056/adf4a9

中国物理B ›› 2025, Vol. 34 ›› Issue (9): 90307-090307.doi: 10.1088/1674-1056/adf4a9

所属专题： SPECIAL TOPIC — Quantum communication and quantum network

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

收稿日期:2025-06-09 修回日期:2025-07-17 接受日期:2025-07-28 出版日期:2025-08-21 发布日期:2025-09-15
通讯作者: Kejin Wei E-mail:kjwei@gxu.edu.cn
基金资助:
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).

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

Received:2025-06-09 Revised:2025-07-17 Accepted:2025-07-28 Online:2025-08-21 Published:2025-09-15
Contact: Kejin Wei E-mail:kjwei@gxu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: mode-pairing quantum key distribution, multi-step advantage distillation, secret key rate

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.

Key words: mode-pairing quantum key distribution, multi-step advantage distillation, secret key rate

中图分类号: (Quantum cryptography and communication security)

03.67.Dd

03.67.Hk (Quantum communication) 03.67.-a (Quantum information)

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[J]. 中国物理B, 2025, 34(9): 90307-090307.

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[J]. Chin. Phys. B, 2025, 34(9): 90307-090307.

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Mode-pairing quantum key distribution with multi-step advantage distillation

Mode-pairing quantum key distribution with multi-step advantage distillation

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