题 目： Would One Enjoy Quantum Secure Group Communication?
报告人： Pro. Mohammad Dhafer Al-Amri（The National Centre for Applied Physics, KACST, Saudi Arabia，Fellow, Institute of Quantum Science and Engineering ,Texas A&M University, USA）
时 间： 04月18日（周三），下午 3:30 - 5:00
地 点： 南校区第一实验楼406会议室
In this talk, I will present our proposes secure quantum communication protocol that allows secure messages to be shared among multiple authorized users. Our protocol is based on Ping-Pong protocol, and the utility of our SLAZ protocol but from different angel this time. SLAZ  indicates that current security strategy is no longer safe, particularly, when an almost ”invisible” photon can reveal the single photon detector without alerting it. Furthermore,  shows that the phase operation acted on the photon also can be found out by the ”invisible” photon. This clearly can be used as hacking mechanism, and we call it counterfactual attack. Hence, it is highly important to defeat this attack, here, we propose a multi-users authorization system that work based on sharing a secure message/key among multi-users resulting in a quantum secure group communication protocol. Emphasizing the fact that the main principle of protection is based on path entanglement, which is impossible for Eve to find out which path information without disturbing the interference.
 Phys.Rev. Lett. 110 170502 (2013).  Phys. Rev. A. 89 052334 (2014).
Mohammad Al-Amri received his MSc in Physics with Distinction from Sussex University, UK in 2001. He went on and got his Ph.D from York University and was the recipient of Stott prize in Physics for the best PhD thesis in 2004. He then joined the National Center for Applied Physics (NCAP), and recently the Center for Quantum Optics and Quantum Informatics CQOQI at King Abdul-Aziz City for Science and Technology (KACST), where he has been working as a professor. He was the recipient of the CO/ICTP Gallieno Denardo Award Winner (2013), and the senior Membership of Optical Society of America (2012). He has been working on different areas of research related to quantum optics and quantum informatics, where the focus is on quantum optical lithography and microscopy, weak measurement, and direct quantum communication. He has published around 65 journal papers, within about 35 published in the Journal of PRL and PRA, and has got 5 patents. Some of Dr. AlAmri's research work has been highlighted in semi-popular press. He has given many lectures, seminars and invited talks at universities and international conferences.