Quantum key distribution offers 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, has proven in theory, which 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. In particular, I will focus on the recent development on the measurement-device-independent scheme and its application to quantum network. Finally, I will conclude with open questions in the field.
Xiongfeng Ma completed his Ph.D. in Physics at the University of Toronto in 2008, under the supervision of Prof. Hoi-Kwong Lo. He joined the Institute for Quantum Computing as a postdoctoral fellow in May of 2008. Xiongfeng’s primary fields of research are quantum key distribution, quantum network, 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, quantum network and design of quantum random number generators.