| SPECIAL TOPIC — Quantum communication and quantum network |
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Improved model on asynchronous measurement-device-independent quantum key distribution with realistic devices |
| Mingshuo Sun(孙铭烁)1,2, Chun-Hui Zhang(张春辉)1,2,†, Rui Zhang(章睿)3, Xing-Yu Zhou(周星宇)1,2, Jian Li(李剑)1,2, and Qin Wang(王琴)1,2,‡ |
1 Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
2 Broadband Wireless Communication and Sensor Network Technology, Key Laboratory of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;
3 Changqing Oilfield Company Digital and Intelligent Business Division, China National Petroleum Corporation, Xi'an 710299, China |
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Abstract In principle, the asynchronous measurement-device-independent quantum key distribution (AMDI-QKD) can surpass the key rate capacity without phase tracking and phase locking. However, practical imperfections in sources or detections would dramatically depress its performance. Here, we present an improved model on AMDI-QKD to reduce the influence of these imperfections, including intensity fluctuation, the afterpulse effect, and the dead time of detectors. Furthermore, we carry out corresponding numerical simulations. Simulation results show that, by implementing our present work, it can have more than 100 km longer secure transmission distance and one order of magnitude enhancement in the key generation rate after 320 km compared with the standard method. Moreover, our model can still break the Pirandola-Laurenza-Ottaviani-Banchi (PLOB) bound even under realistic experimental conditions.
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Received: 08 July 2024
Revised: 26 August 2024
Accepted manuscript online: 30 August 2024
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PACS:
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03.67.Hk
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(Quantum communication)
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03.67.Dd
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(Quantum cryptography and communication security)
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03.67.-a
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(Quantum information)
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03.67.Lx
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(Quantum computation architectures and implementations)
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| Fund: Project supported by Natural Science Foundation of Jiangsu Province (Grant Nos. BE2022071 and BK20192001),the National Natural Science Foundation of China (Grant Nos. 12074194, 62101285, 62471248, and 12104240), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX22 0954). |
Corresponding Authors:
Chun-Hui Zhang, Qin Wang
E-mail: chz@njupt.edu.cn;qinw@njupt.edu.cn
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Cite this article:
Mingshuo Sun(孙铭烁), Chun-Hui Zhang(张春辉), Rui Zhang(章睿), Xing-Yu Zhou(周星宇), Jian Li(李剑), and Qin Wang(王琴) Improved model on asynchronous measurement-device-independent quantum key distribution with realistic devices 2024 Chin. Phys. B 33 110302
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