论文标题
发送或不降低双电场量子键分布的通用方法
Universal approach to sending-or-not-sending twin field quantum key distribution
论文作者
论文摘要
我们介绍了在位纤维误差校正和使用机密观察到的数字后诱饵状态分析的方法。然后使用此工具，我们构建了一种通用方法，用于发送双场量子键分布的发送或不启用（SNS）协议。在此改进的协议中，代码位不仅限于随着时间的时间窗口中的预示事件，该事件是由强度$μ_z$和真空吸尘器参与的。各种宣传事件可用于代码位来提炼最终键。密码优化本身会自动选择强度（3或4）的数量（3或4）和代码位的宣传事件。数值模拟表明，与先前的结果相比，在典型的设置中，关键率急剧上升，最高80 \％。同样，较大的强度值可用于诱饵脉冲。这使得协议在实际实验中更强大。
We present the method of decoy-state analysis after bit-flip error correction and using confidential observed numbers. Taking this tool we then construct a universal approach to sending-or-not-sending (SNS) protocol of twin-field quantum key distribution. In this improved protocol, the code bits are not limited to heralded events in time windows participated by pulses of intensity $μ_z$ and vacuum. All kinds of heralded events can be used for code bits to distill the final keys. The number of intensities (3 or 4) and the kinds of heralded events for code bits are automatically chosen by the key rate optimization itself. Numerical simulation shows that the key rate rises drastically in typical settings, up to 80\% improvement compared with the prior results. Also, larger intensity value can be used for decoy pulses. This makes the protocol more robust in practical experiments.
