Scholarlink

<p>Mode-pairing quantum key distribution (MP-QKD) protocol can surpass the Pirandola–Laurenza–Ottaviani–Banchi bound (PLOB bound) of non-quantum repeaters without requiring global phase locking, making it the best-performing protocol. MP-QKD employs weak coherent source (WCS), which has a lower probability of sending single photons. Reducing the proportion of multi-photon events can better defend against photon number splitting (PNS) is a key issue that QKD needs to address. Compared to WCS, single-photon added coherent state (SPACS) is closer to an ideal single-photon source. We apply SPACS to MP-QKD and simulate its key rate-distance performance. Our simulations show that SPACS-MP-QKD outperforms the original MP-QKD in both transmission distance and key rate, achieving an increase of approximately 60&#xa0;km in communication distance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mode-pairing quantum key distribution with the single-photon-added coherent source

  • 期刊论文

  • 发表日期：

    2026年3月27日

查看全文
  • Kaiyi Shi,
  • Haoyang Wang,
  • Yujia Zhang,
  • Duo Ma,
  • Fangze Ma,
  • Haiqiang Ma

摘要

Mode-pairing quantum key distribution (MP-QKD) protocol can surpass the Pirandola–Laurenza–Ottaviani–Banchi bound (PLOB bound) of non-quantum repeaters without requiring global phase locking, making it the best-performing protocol. MP-QKD employs weak coherent source (WCS), which has a lower probability of sending single photons. Reducing the proportion of multi-photon events can better defend against photon number splitting (PNS) is a key issue that QKD needs to address. Compared to WCS, single-photon added coherent state (SPACS) is closer to an ideal single-photon source. We apply SPACS to MP-QKD and simulate its key rate-distance performance. Our simulations show that SPACS-MP-QKD outperforms the original MP-QKD in both transmission distance and key rate, achieving an increase of approximately 60 km in communication distance.