Random numbers are essential for our modern information based society e.g. incryptography. Unlike frequently used pseudo-random generators, physical randomnumber generators do not depend on complex algorithms but rather on a physicalprocess to provide true randomness. Quantum random number generators (QRNG) dorely on a process, which can be described by a probabilistic theory only, evenin principle. Here we present a conceptually simple implementation, whichoffers a 100% efficiency of producing a random bit upon a request andsimultaneously exhibits an ultra low latency. A careful technical andstatistical analysis demonstrates its robustness against imperfections of theactual implemented technology and enables to quickly estimate randomness ofvery long sequences. Generated random numbers pass standard statistical testswithout any post-processing. The setup described, as well as the theorypresented here, demonstrate the maturity and overall understanding of thetechnology.
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