Using complete measurement statistics for optimal device-independent randomness evaluation
arXiv:1309.3930 · doi:10.1088/1367-2630/16/1/013035
Abstract
The majority of recent works investigating the link between non-locality and randomness, e.g. in the context of device-independent cryptography, do so with respect to some specific Bell inequality, usually the CHSH inequality. However, the joint probabilities characterizing the measurement outcomes of a Bell test are richer than just the degree of violation of a single Bell inequality. In this work we show how to take this extra information into account in a systematic manner in order to optimally evaluate the randomness that can be certified from non-local correlations. We further show that taking into account the complete set of outcome probabilities is equivalent to optimizing over all possible Bell inequalities, thereby allowing us to determine the optimal Bell inequality for certifying the maximal amount of randomness from a given set of non-local correlations.
12 pages, 4 figures. v2, v3, v4: minor corrections. See also the related independent work arXiv:1309.3894
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