信息与量子学术沙龙【第7期-戚若阳】


主讲人戚若阳 博士生

时间201934日(周一),上午10:00

主题Implementation and security analysis of practical quantum secure direct communication

地点:沙河校区通信楼725会议室

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报告人简介:

戚若阳,中国人民大学优秀毕业生,2015年进入清华大学物理系低维量子物理国家重点实验室,直博,从事量子信息方面的研究工作,申请专利3项,一作发表Light Science & Application等文章2篇,由龙桂鲁教授指导。龙桂鲁教授长期从事量子信息理论和实验研究,曾获国家自然科学二等奖、三等奖,教育部自然科学一等奖、二等奖,汤森路透卓越研究奖,饶毓泰物理奖,全国优博导师,发表 SCI 论文近300篇。2016年当选亚太物理学会联合会理事长,美国物理学会、英国物理学会会士,是国际上著名的量子信息专家。

 

报告摘要:

Rapid development of supercomputers and the prospect of quantum computers are posing increasingly serious threats to the security of communication. Using the principles of quantum mechanics, quantum communication offers provable security of communication and is a promising solution to counter such threats. Quantum secure direct communication (QSDC) is one important branch of quantum communication. In contrast to other branches of quantum communication, it transmits secret information directly. Recently, remarkable progress has been made in proof-of-principle experimental demonstrations of QSDC. However, it remains a technical feat to bring QSDC into a practical application. Here, we report the implementation of a practical quantum secure communication system. The security is analyzed in the Wyner wiretap channel theory. The system uses a coding scheme of concatenation of low density parity-check (LDPC) codes and works in a regime with a realistic environment of high noise and high loss. The present system operates with a repetition rate of 1 MHz at a distance of 1.5 kilometers. The secure communication rate is 50 bps, sufficient to effectively send text messages and reasonably sized files of images and sounds.