A quantum noise random number generator system that employs quantum noise
from an optical homodyne detection apparatus is disclosed. The system
utilizes the quantum noise generated by splitting a laser light signal
using a beamsplitter having four ports, one of which receives one of
which is receives the laser light signal, one of which is connected to
vacuum, and two of which are optically coupled to photodetectors.
Processing electronics process the difference signal derived from
subtracting the two photodetector signals to create a random number
sequence. Because the difference signal associated with the two
photodetectors is truly random, the system is a true random number
generator.