  Random numbers have significant applications in fundamental science,
high-level scientific research, cryptography, and several other areas where
there is a pressing need for high-quality random numbers. We present an
experimental demonstration of a non-deterministic random bit generator from a
quantum entropy source and a deterministic random bit generator mechanism to
provide high quality random numbers providing a throughput of 1 Gb. Quantum
entropy is realized by a series of quantum chips based on radioactive isotope
Americium-241. The extracted raw random numbers are further post-processed to
generate a high-entropy seed for the hash based deterministic random bit
generator. We discuss the implementation of randomness extraction algorithm and
Hash-DRBG algorithm in detail. The random numbers pass all randomness measures
provided in ENT and NIST test suites.
