You have received a device that is claimed to produce random numbers, but you don't trust it. Can you check it without opening it? In some cases, you can, thanks to the bizarre nature of quantum physics.
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Scarani, V. Guaranteed randomness. Nature 464, 988–989 (2010). https://doi.org/10.1038/464988a
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DOI: https://doi.org/10.1038/464988a
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