Experimental demonstration of long-distance continuous-variable quantum key distribution
Experimental demonstration of long-distance continuous-variable quantum key distribution
复制标题
DOI：
10.1038/nphoton.2013.63
复制
发表时间：
2013-05-01
期刊：
影响因子：
35
通讯作者：
Diamanti, Eleni
中科院分区：
文献类型：
--
作者：
Jouguet, Paul;Kunz-Jacques, Sebastien;Diamanti, Eleni
使用信息理论安全性分发秘密密钥可以说是量子信息处理和通信领域最重要的成就之一（1）。该领域的快速进步使现实情况下的量子键分布（2,3），现在很容易获得商业设备。基于连续变量（4）的量子密钥分布系统提供了主要优势，即它们仅需要标准的电信技术。但是，迄今为止，这些系统被认为不适合长途通信（5-7）。在这里，我们克服了所有以前的局限性，并在80 km的光纤上首次进行连续变量的量子键分布。考虑了实际情况的所有方面，包括使用有限大小的数据块用于秘密信息计算和关键蒸馏。我们的结果对应于实施，以确保到目前为止报告的量子密钥分布的最强安全性水平，并为安全量子通信的实际应用铺平了道路。
Distributing secret keys with information-theoretic security is arguably one of the most important achievements of the field of quantum information processing and communications(1). The rapid progress in this field has enabled quantum key distribution in real-world conditions(2,3) and commercial devices are now readily available. Quantum key distribution systems based on continuous variables(4) provide the major advantage that they only require standard telecommunication technology. However, to date, these systems have been considered unsuitable for long-distance communication(5-7). Here, we overcome all previous limitations and demonstrate for the first time continuous-variable quantum key distribution over 80 km of optical fibre. All aspects of a practical scenario are considered, including the use of finite-size data blocks for secret information computation and key distillation. Our results correspond to an implementation guaranteeing the strongest level of security for quantum key distribution reported so far for such long distances and pave the way to practical applications of secure quantum communications.