Abstract

Quantum physics can provide intrinsically unpredictable randomness which is a significant resource in cryptography. How to quantify intrinsic randomness of the outcomes from a generic measurement is a basic but unsettled problem. We establish an adversarial scenario and extend the usual Naimark extension approach. Then we characterize intrinsic randomness and find some interesting phenomena. For instance, under certain measurements such as the symmetric and information-complete measurement, all states have nonzero randomness. This observation can help us design source-independent quantum random number generators.

Speaker Intro

Hao Dai is a postdoctoral fellow in the research group led by Prof. Xiongfeng Ma, at Tsinghua University. Dr. Dai received her Ph.D. under the supervision of Prof. Shunlong Luo at Chinese Academy of Sciences. Main research interests include quantum information and computation.