用于城市日光应用的高速自由空间量子密钥分发系统。

High-speed free-space quantum key distribution system for urban daylight applications.

作者信息

García-Martínez M J, Denisenko N, Soto D, Arroyo D, Orue A B, Fernandez V

机构信息

Information Security Institute, Spanish National Research Council (CSIC), Serrano 144, Madrid 28006, Spain.

出版信息

Appl Opt. 2013 May 10;52(14):3311-7. doi: 10.1364/AO.52.003311.

DOI:10.1364/AO.52.003311

PMID:23669845

Abstract

We report a free-space quantum key distribution system designed for high-speed key transmission in urban areas. Clocking the system at gigahertz frequencies and efficiently filtering background enables higher secure key rates than those previously achieved by similar systems. The transmitter and receiver are located in two separate buildings 300 m apart in downtown Madrid and they exchange secure keys at rates up to 1 Mbps. The system operates in full bright daylight conditions with an average secure key rate of 0.5 Mbps and 24 h stability without human intervention.

摘要

我们报告了一种为在城市地区进行高速密钥传输而设计的自由空间量子密钥分发系统。以吉赫兹频率为该系统提供时钟信号并有效过滤背景噪声，可实现比类似系统此前所达到的更高的安全密钥率。发射器和接收器位于马德里市中心相距300米的两栋独立建筑中，它们以高达1 Mbps的速率交换安全密钥。该系统在全光照的白天条件下运行，平均安全密钥率为0.5 Mbps，且无需人工干预即可实现24小时稳定运行。