A quantum random number generator (QRNG) can generate true randomness by exploiting the fundamental indeterminism of quantum mechanics. Most approaches to QRNG employ single-photon detection technologies and are limited in speed. Here, we propose and experimentally demonstrate an ultrafast QRNG at a rate over 6 Gb/s based on the quantum phase fluctuations of a laser operating near threshold. Moreover, we consider a potential adversary who has partial knowledge on the raw data and discuss how one can rigorously remove such partial knowledge with post-processing. We quantify the quantum randomness through min-entropy by modeling our system, and employ two extractors, Trevisan's extractor and Toeplitz-hashing, to distill the randomness, which is information-theoretically provable. The simplicity and high-speed of our experimental setup show the feasibility of a robust, low-cost, high-speed QRNG.
@article{arxiv.1109.0643,
title = {Ultrafast quantum random number generation based on quantum phase fluctuations},
author = {Feihu Xu and Bing Qi and Xiongfeng Ma and He Xu and Haoxuan Zheng and Hoi-Kwong Lo},
journal= {arXiv preprint arXiv:1109.0643},
year = {2013}
}