  Quantum random number generation exploits inherent randomness of quantum
mechanical processes and measurements. Real-time generation rate of quantum
random numbers is usually limited by electronic bandwidth and data processing
rates. Here we use a multiplexing scheme to create a fast real-time quantum
random number generator based on continuous variable vacuum fluctuations.
Multiple sideband frequency modes of a quantum vacuum state within a homodyne
detection bandwidth are concurrently extracted as the randomness source.
Parallel post-processing of raw data from three sub-entropy sources is realized
in one field-programmable gate array (FPGA) based on Toeplitz-hashing
extractors. A cumulative generation rate of 8.25 Gbps in real-time is achieved.
The system relies on optoelectronic components and circuits that could be
integrated in a compact, economical package.
