Quantum random-number generator based on a photon-number-resolving detector

We demonstrated a high-efficiency quantum random number generator which takes inherent advantage of the photon number distribution randomness of a coherent light source. This scheme was realized by comparing the photon flux of consecutive pulses with a photon number resolving detector. The random bit generation rate could reach $2.4$ MHz with a system clock of $6.0$ MHz, corresponding to a random bit generation efficiency as high as $40%$. The random number files passed all the stringent statistical tests.