  We propose and demonstrate a scheme to realize a high-efficiency truly
quantum random number generator (RNG) at room temperature (RT). Using an
effective extractor with simple time bin encoding method, the avalanche pulses
of avalanche photodiode (APD) are converted into high-quality random numbers
(RNs) that are robust to slow varying noise such as fluctuations of pulse
intensity and temperature. A light source is compatible but not necessary in
this scheme. Therefor the robustness of the system is effective enhanced. The
random bits generation rate of this proof-of-principle system is 0.69 Mbps with
double APDs and 0.34 Mbps with single APD. The results indicate that a
high-speed RNG chip based on the scheme is potentially available with an
integrable APD array.
