Abstract：
:Do completely unpredictable events exist? Classical physics excludes fundamental randomness. Although quantum theory makes probabilistic predictions, this does not imply that nature is random, as randomness should be certified without relying on the complete structure of the theory being used. Bell tests approach the question from this perspective. However, they require prior perfect randomness, falling into a circular reasoning. A Bell test that generates perfect random bits from bits possessing high-but less than perfect-randomness has recently been obtained. Yet, the main question remained open: does any initial randomness suffice to certify perfect randomness? Here we show that this is indeed the case. We provide a Bell test that uses arbitrarily imperfect random bits to produce bits that are, under the non-signalling principle assumption, perfectly random. This provides the first protocol attaining full randomness amplification. Our results have strong implications onto the debate of whether there exist events that are fully random.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Gallego R,Masanes L,De La Torre G,Dhara C,Aolita L,Acín Adoi
10.1038/ncomms3654subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2654issn
2041-1723pii
ncomms3654journal_volume
4pub_type
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