title: High-speed quantum-random number generation by continuous measurement of arrival time of photons.
abstract: We demonstrate a novel high speed and multi-bit optical quantum random number generator by continuously measuring arrival time of photons with a common starting point. To obtain the unbiased and post-processing free random bits, the measured photon arrival time is converted into the sum of integral multiple of a fixed period and a phase time. Theoretical and experimental results show that the phase time is an independent and uniform random variable. A random bit extraction method by encoding the phase time is proposed. An experimental setup has been built and the unbiased random bit generation rate could reach 128 Mb/s, with random bit generation efficiency of 8 bits per detected photon. The random numbers passed all tests in the statistical test suite.
authors.affiliation: Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China.
authors.forename: Qiurong
authors.initials: Q
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
authors.forename: Baosheng
authors.initials: B
authors.lastname: Zhao
authors.affiliation: Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China.
authors.forename: Zhang
authors.initials: Z
authors.lastname: Hua
authors.affiliation: Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China.
authors.forename: Qinghong
authors.initials: Q
authors.lastname: Liao
authors.affiliation: Shannxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Yang