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Quantum random number generators (QRNG) are based on the naturally randommeasurement results performed on individual quantum systems. Here, wedemonstrate a branching-path photonic QRNG implemented with a Sagnacinterferometer with a tunable splitting ratio. The fine-tuning of the splittingratio allows us to maximize the entropy of the generated sequence of randomnumbers and effectively compensate for tolerances in the components. Byproducing single-photons from attenuated telecom laser pulses, and employingcommercially-available components we are able to generate a sequence of morethan 2 gigabytes of random numbers with an average entropy of 7.99 bits/bytedirectly from the raw measured data. Furthermore, our sequence passesrandomness tests from both the NIST and Dieharder statistical test suites, thuscertifying its randomness. Our scheme shows an alternative design of QRNGsbased on the dynamic adjustment of the uniformity of the produced randomsequence, which is relevant for the construction of modern generators that relyon independent real-time testing of its performance.

A tunable quantum random number generator based on a fiber-optical Sagnac interferometer