From quantum hacking to self-testing 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 self-testing 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. Hoi-Kwong 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, self-testing quantum key distribution protocols, and design of quantum random number generators.