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<p>Reference-frame-independent quantum key distribution (RFI-QKD) offers a promising solution for secure key distribution between remote users while eliminating the requirement for real-time reference frame alignment. However, the security of RFI-QKD is critically vulnerable to device flaws and imperfect random numbers. In this work, we investigate the impact of weak randomness on the state preparation in RFI-QKD, demonstrating that even a small proportion of weak randomness severely compromises security. Additionally, in order to improve the performance of practical RFI-QKD with weak randomness, the advantage distillation method is introduced. Simulation results demonstrate that advantage distillation can significantly improve the secret key rate and transmission distance.</p>

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Performance analysis of practical reference-frame-independent quantum key distribution with weak randomness

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Jian-Rong Zhu,
  • Yu-Hang Zhao,
  • Chuan-Hao Shu,
  • Chun-Mei Zhang,
  • Hong-Wei Li

摘要

Reference-frame-independent quantum key distribution (RFI-QKD) offers a promising solution for secure key distribution between remote users while eliminating the requirement for real-time reference frame alignment. However, the security of RFI-QKD is critically vulnerable to device flaws and imperfect random numbers. In this work, we investigate the impact of weak randomness on the state preparation in RFI-QKD, demonstrating that even a small proportion of weak randomness severely compromises security. Additionally, in order to improve the performance of practical RFI-QKD with weak randomness, the advantage distillation method is introduced. Simulation results demonstrate that advantage distillation can significantly improve the secret key rate and transmission distance.