论文标题
香农 - 限制接近信息对帐进行量子密钥分布
Shannon-Limit Approached Information Reconciliation for Quantum Key Distribution
论文作者
论文摘要
信息核对（IR）纠正了筛选键中的错误，并确保量子密钥分布（QKD）系统的正确性。基于极地代码的IR计划可以实现高对帐效率，但是，偶然的高框架错误率降低了QKD系统的安全密钥速率。在本文中，我们提出了一种访问的Shannon-limit（SLA）IR方案，该方案主要包含两个阶段：前向和解阶段和确认对帐阶段。在正向对帐阶段，筛分的键被分为子块，并通过改进的块检查后连续的取消列表（BC-SCL）解码器进行了筛选。之后，只有故障校正的子块执行额外的确认对帐阶段，从而降低了SLA IR方案的帧错误率。实验结果表明，SLA IR方案的总体故障概率降低至$ 10^{ - 8} $，效率提高到1.091，IR块长度为128MB。此外，当量子位错误率为0.02时，所提出的SLA IR方案的效率为1.055，可用于香农限制，而输入量表为1GB，比最新实现的基于极性的IR基于基于极地代码的IR计划大百倍。
Information reconciliation (IR) corrects the errors in sifted keys and ensures the correctness of quantum key distribution (QKD) systems. Polar codes-based IR schemes can achieve high reconciliation efficiency, however, the incidental high frame error rate decreases the secure key rate of QKD systems. In this article, we propose a Shannon-limit approached (SLA) IR scheme, which mainly contains two phases: the forward reconciliation phase and the acknowledgment reconciliation phase. In the forward reconciliation phase, the sifted key is divided into sub-blocks and performed with the improved block checked successive cancellation list (BC-SCL) decoder of polar codes. Afterwards, only the failure corrected sub-blocks perform the additional acknowledgment reconciliation phase, which decreases the frame error rate of the SLA IR scheme. The experimental results show that the overall failure probability of SLA IR scheme is decreased to $10^{-8}$ and the efficiency is improved to 1.091 with the IR block length of 128Mb. Furthermore, the efficiency of the proposed SLA IR scheme is 1.055, approached to Shannon-limit, when quantum bit error rate is 0.02 and the input scale of 1Gb, which is hundred times larger than the state-of-art implemented polar codes-based IR schemes.
