Data and Time 
March 29 , 2011, 3:004:15 PM 
Location 
Sanford Flemming Building, Room B560 
Host 
Alex Wong 
From quantum hacking to selftesting quantum key distribution
Xiongfeng Ma
The Edward S. Rogers Sr. Department of Electrical and Computer Engineering (Photonics)
Abstract:
Quantum key distribution allows two distant users to establish a random secure key by exploiting properties of quantum mechanics. The security of a few quantum key distribution protocols, such as BB84, which has been proven in theory, relies on certain assumptions of device models. In practice, imperfections of devices may open up loopholes for quantum hacking strategies. In this talk, I will give a brief introduction of quantum cryptosystems and a couple of effective attacks. Then I will present selftesting protocols, which can minimize loopholes in a quantum cryptosystem. Finally, I will conclude with open questions in the field.
Biography:
Xiongfeng Ma completed his Ph.D. in Physics at the University of Toronto in2008, under the supervision of Prof. HoiKwong Lo. He joined the Institutefor Quantum Computing as a postdoctoral fellow in May of 2008. Xiongfeng'sprimary fields of research are quantum key distribution, quantum hacking,nonlocality and random number generation. In particular, he is interested in practical quantum key distribution with optical implementations, selftesting quantum key distribution protocols, and design of quantum
random number generators.




