  Previously, we built up a set of photon-free quantum random number
generator(QRNG) with InGaAs single photon avalanche diodes. We exploited the
stochastic property of quantum tunneling effect. Here, we utilized tunneling
signals in Si diodes to implement quantum random number generator. In our
experiment, instead of applying periodic pulses between the diode as we did in
the InGaAs QRNG, we applied fixed voltage and detect time intervals between
adjacent tunneling signals, as random source. This Si QRNG has a high
performance in the randomness of its raw data and almost post-processing-free.
Final data rate in our experiment is 6.98MB/s and could reach 23MB/s if the
temperature-control system is ameliorated.
