论文标题
长距离连续可变的测量设备与量子键分布与选择后量子键分布
Long-distance continuous-variable measurement-device-independent quantum key distribution with post-selection
论文作者
论文摘要
我们引入了一个坚固的方案，用于长距离连续变化（CV）测量设备独立的（MDI）量子密钥分布（QKD），其中我们在通过不信任继电器的介质进行交流的遥远各方之间采用后选择。我们执行了一个安全分析，该分析允许每个链接的一般传输率和热噪声方差，我们假设窃听者会执行集体攻击并控制通道中的热噪声。选拔后的引入使当事方能够在超过现有CV MDI协议的距离上维持秘密关键率。在最糟糕的情况下，继电器之间的位置位于它们之间的位置，我们发现当事方可以在标准光纤中牢固地在14公里的范围内牢固地通信。我们的协议有助于克服先前提出的CV MDI协议的速率限制，同时保持其许多优势。
We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution (QKD) in which we employ post-selection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for general transmissivity and thermal noise variance of each link, in which we assume an eavesdropper performs a collective attack and controls the excess thermal noise in the channels. The introduction of post-selection enables the parties to sustain a secret key rate over distances exceeding those of existing CV MDI protocols. In the worst-case scenario in which the relay is positioned equidistant between them, we find that the parties may communicate securely over a range of 14 km in standard optical fiber. Our protocol helps to overcome the rate-distance limitations of previously proposed CV MDI protocols while maintaining many of their advantages.
