Improving the performance of twin-field quantum key distribution with advantage distillation technology

Hong-Wei Li; Rui-Qiang Wang; Chun-Mei Zhang; Qing-Yu Cai

doi:10.22331/q-2023-12-06-1201

Improving the performance of twin-field quantum key distribution with advantage distillation technology

Hong-Wei Li¹, Rui-Qiang Wang², Chun-Mei Zhang³, and Qing-Yu Cai⁴

¹Henan Key Laboratory of Quantum Information and Cryptography, SSF IEU, Zhengzhou 450000, China
²CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China
³Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
⁴School of Information and Communication Engineering, Hainan University, Haikou 570228, China

Published:	2023-12-06, volume 7, page 1201
Eprint:	arXiv:2202.10059v6
Doi:	https://doi.org/10.22331/q-2023-12-06-1201
Citation:	Quantum 7, 1201 (2023).

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Abstract

In this work, we apply the advantage distillation method to improve the performance of a practical twin-field quantum key distribution system under collective attack. Compared with the previous analysis result given by Maeda, Sasaki and Koashi [Nature Communication 10, 3140 (2019)], the maximal transmission distance obtained by our analysis method will be increased from 420 km to 470 km. By increasing the loss-independent misalignment error to 12%, the previous analysis method can not overcome the rate-distance bound. However, our analysis method can still overcome the rate-distance bound when the misalignment error is 16%. More surprisingly, we prove that twin-field quantum key distribution can generate positive secure key even if the misalignment error is close to 50%, thus our analysis method can significantly improve the performance of a practical twin-field quantum key distribution system.

► BibTeX data

@article{Li2023improving,
  doi = {10.22331/q-2023-12-06-1201},
  url = {https://doi.org/10.22331/q-2023-12-06-1201},
  title = {Improving the performance of twin-field quantum key distribution with advantage distillation technology},
  author = {Li, Hong-Wei and Wang, Rui-Qiang and Zhang, Chun-Mei and Cai, Qing-Yu},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {7},
  pages = {1201},
  month = dec,
  year = {2023}
}

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