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Based on the intrinsic random property of quantum mechanics, quantum randomnumber generators allow for access of truly unpredictable random sequence andare now heading towards high performance and small miniaturization, among whicha popular scheme is based on the laser phase noise. However, this scheme isgenerally limited in speed and implementation complexity, especially for chipintegration. In this work, a general physical model based on wiener process forsuch schemes is introduced, which provides an approach to clearly explain thelimitation on the generation rate and comprehensively optimize the systemperformance. We present an insight to exploit the potential bandwidth of thequantum entropy source that contains plentiful quantum randomness with a simplespectral filtering method and experimentally boost the bandwidth of thecorresponding quantum entropy source to 20 GHz, based on which an ultra-fastgeneration rate of 218 Gbps is demonstrated, setting a new record for laserphase noise based schemes by one order of magnitude. Our proposal significantlyenhances the ceiling speed of such schemes without requiring extra complexhardware, thus effectively benefits the corresponding chip integration withhigh performance and low implementation cost, which paves the way for itslarge-scale applications.

An Ultra-fast Quantum Random Number Generation Scheme Based on Laser Phase Noise