  We demonstrate a random bit streaming system that uses a chaotic laser as its
physical entropy source. By performing real-time bit manipulation for bias
reduction, we were able to provide the memory of a personal computer with a
constant supply of ready-to-use physical random bits at a throughput of up to 4
Gbps. We pay special attention to the end-to-end entropy source model
describing how the entropy from physical sources is converted into bit entropy.
We confirmed the statistical quality of the generated random bits by revealing
the pass rate of the NIST SP800-22 test suite to be 65 % to 75 %, which is
commonly considered acceptable for a reliable random bit generator. We also
confirmed the stable operation of our random bit steaming system with long-term
bias monitoring.
