Gehring Tobias, Händchen Vitus, Duhme Jörg, Furrer Fabian, Franz Torsten, Pacher Christoph, Werner Reinhard F, Schnabel Roman
Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), and Institut für Gravitationsphysik Leibniz Universität Hannover, Callinstraße 38, 30167 Hannover, Germany.
Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark.
Nat Commun. 2015 Oct 30;6:8795. doi: 10.1038/ncomms9795.
Secret communication over public channels is one of the central pillars of a modern information society. Using quantum key distribution this is achieved without relying on the hardness of mathematical problems, which might be compromised by improved algorithms or by future quantum computers. State-of-the-art quantum key distribution requires composable security against coherent attacks for a finite number of distributed quantum states as well as robustness against implementation side channels. Here we present an implementation of continuous-variable quantum key distribution satisfying these requirements. Our implementation is based on the distribution of continuous-variable Einstein-Podolsky-Rosen entangled light. It is one-sided device independent, which means the security of the generated key is independent of any memoryfree attacks on the remote detector. Since continuous-variable encoding is compatible with conventional optical communication technology, our work is a step towards practical implementations of quantum key distribution with state-of-the-art security based solely on telecom components.
公共信道上的秘密通信是现代信息社会的核心支柱之一。利用量子密钥分发可实现这一点，且无需依赖数学问题的难度，因为这些数学问题可能会因算法改进或未来量子计算机而受到威胁。先进的量子密钥分发要求对于有限数量的分布式量子态具备针对相干攻击的可组合安全性，以及针对实现侧信道的稳健性。在此，我们展示了一种满足这些要求的连续变量量子密钥分发实现方案。我们的实现基于连续变量爱因斯坦 - 波多尔斯基 - 罗森纠缠光的分发。它是单边设备无关的，这意味着所生成密钥的安全性独立于对远程探测器的任何无记忆攻击。由于连续变量编码与传统光通信技术兼容，我们的工作朝着仅基于电信组件实现具有先进安全性的量子密钥分发的实际应用迈出了一步。
