科学研究

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【学术活动】Security of Quantum Key Distribution

Speaker(报告人): A/Professor ZhenQiang Yin(银振强), CAS Key Laboratory of Quantum Information, University of Science and Technology of China.
Host(院内联系人): A/Profofessor Yin Li(李颖)

Date & Time(时间): January 31, 2018 (Wednesday) 14:00~15:00 PM
Venue(地点): C407 Conference Room, 4th Floor
(中物院研究生院软件园校区4层C407会议室,海淀区西北旺东路10号院9号楼)

Abstract:  Unlike public-key cryptography, whose security relies on unproven mathematical assumptions, quantum key distribution (QKD) can information-theoretically distribute secret key bits between distant peers, thus attracts intensive studies. In this talk, I will first review the basic conceptions and flows of the commonly used QKD protocols, e.g. BB84. Then I focus on why this protocol is assumed to be “unconditional secure” in theory and how to prove its security strictly from some simple and reasonable assumptions. While the security of protocol had been proved, the real-life setups may be vulnerable to some side-channel attacks due to some imperfections of devices used to implement QKD setups. Hence the issue of security of practical QKD system will be introduced here. In practice, many techniques, e.g. decoy states, device-independent and measurement-device-independent schemes, are proposed to beat loopholes of practical QKD systems. Finally, I summarize the study of QKD and depict its future trends.

Biography:Zhen-Qiang Yin obtained his doctoral degree of science in the University of Science and Technology of China (USTC) in 2010, now is an associate professor in the key lab of quantum information, USTC. He has long been engaged in the research of quantum information and quantum cryptography. He is a principal investigator of national key research and development program of China and programs from national natural science foundation of China. In the field of quantum cryptography, he has published more than 80 SCI papers in Nature Photonics, Nature Communications, Physical Review Letters, Optica, and other well-known academic journals. His H-factor has reached 17.

All interested are welcome!