Sasaki Masahide, Endo Hiroyuki, Fujiwara Mikio, Kitamura Mitsuo, Ito Toshiyuki, Shimizu Ryosuke, Toyoshima Morio
Quantum ICT Advanced Development Center, National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan
Quantum ICT Advanced Development Center, National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan.
Philos Trans A Math Phys Eng Sci. 2017 Aug 6;375(2099). doi: 10.1098/rsta.2016.0243.
Quantum communication and quantum cryptography are expected to enhance the transmission rate and the security (confidentiality of data transmission), respectively. We study a new scheme which can potentially bridge an intermediate region covered by these two schemes, which is referred to as quantum photonic network. The basic framework is information theoretically secure communications in a free space optical (FSO) wiretap channel, in which an eavesdropper has physically limited access to the main channel between the legitimate sender and receiver. We first review a theoretical framework to quantify the optimal balance of the transmission efficiency and the security level under power constraint and at finite code length. We then present experimental results on channel characterization based on 10 MHz on-off keying transmission in a 7.8 km terrestrial FSO wiretap channel.This article is part of the themed issue 'Quantum technology for the 21st century'.
量子通信和量子密码学有望分别提高传输速率和安全性（数据传输的保密性）。我们研究了一种新方案，该方案有可能连接这两种方案所涵盖的中间区域，即所谓的量子光子网络。其基本框架是自由空间光（FSO）窃听信道中的信息理论安全通信，其中窃听者对合法发送方和接收方之间的主信道的访问受到物理限制。我们首先回顾一个理论框架，以量化在功率约束和有限码长下传输效率和安全级别之间的最佳平衡。然后，我们展示了基于7.8公里地面FSO窃听信道中10MHz通断键控传输的信道特性实验结果。本文是“21世纪量子技术”主题 issue 的一部分。
