论文标题
通过优势蒸馏技术提高双场量子键分布的性能
Improving the performance of twin-field quantum key distribution with advantage distillation technology
论文作者
论文摘要
在这项工作中，我们将优势蒸馏方法应用于集体攻击下实用的双场量子键分配系统的性能。与Maeda，Sasaki和Koashi [自然通信10，3140（2019）]给出的先前分析结果相比，通过我们的分析方法获得的最大传输距离将从420公里增加到470公里。通过将无关损失的未对准误差增加到12％，先前的分析方法无法克服率距离结合。但是，当未对准误差为16％时，我们的分析方法仍然可以克服率距离。更令人惊讶的是，我们证明，即使未对准误差接近50％，双场量子键分布也可以生成正面的安全密钥，因此我们的分析方法可以显着提高实用的双场量子量子键分配系统的性能。
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.
