Abstract:
In this short report we present a detailed analysis of long sequences of bits produced
by a Quantis quantum random number generator. We find that the output is slightly
biased, and nearby bits are partially correlated with a correlation length of 2 bits. We
briefly discuss possible physical origins for this, as well as possible normalisation techniques
that can help correct for this ‘on the fly’, as opposed to post-processing produced bits in
bulk. The non-uniformity found is small, but it is nonetheless important to understand
and characterise this given the recent growth in importance of quantum random number
generators.
