Collins Robert J, Amiri Ryan, Fujiwara Mikio, Honjo Toshimori, Shimizu Kaoru, Tamaki Kiyoshi, Takeoka Masahiro, Andersson Erika, Buller Gerald S, Sasaki Masahide
Opt Lett. 2016 Nov 1;41(21):4883-4886. doi: 10.1364/OL.41.004883.
Quantum digital signatures (QDSs) apply quantum mechanics to the problem of guaranteeing message integrity and non-repudiation with information-theoretical security, which are complementary to the confidentiality realized by quantum key distribution (QKD). Previous experimental demonstrations have been limited to transmission distances of less than 5 km of optical fiber in a laboratory setting. Here we report, to the best of our knowledge, the first demonstration of QDSs over installed optical fiber, as well as the longest transmission link reported to date. This demonstration used a 90 km long differential phase shift QKD to achieve approximately one signed bit per second, an increase in the signature generation rate of several orders of magnitude over previous optical fiber demonstrations.
量子数字签名（QDS）将量子力学应用于通过信息理论安全性保证消息完整性和不可否认性的问题，这与量子密钥分发（QKD）实现的保密性相辅相成。先前的实验演示仅限于实验室环境中小于5公里的光纤传输距离。据我们所知，在此我们报告了首次在已安装的光纤上进行的量子数字签名演示，以及迄今为止报道的最长传输链路。该演示使用了一条90公里长的差分相移量子密钥分发，每秒实现大约一个签名比特，签名生成速率比之前的光纤演示提高了几个数量级。
