Arithmetic loophole in Bell's theorem, prof. Marek Czachor

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The Einstein-Rosen-Podolski paradox (1935) and its more recent version, known as Bell's Theorem (1964), have for many years been treated as a kind of curiosity about our understanding of quantum physics. The breakthrough came around 1990, when it was realized that the reasoning proposed by Bell could become the basis for a completely new approach to the problem of data encryption security. It resulted in the emergence of quantum cryptography, a field whose creators deservedly await the Nobel Prize in physics. It is not surprising, however, that the emergence of quantum encryption systems was accompanied by the appearance of quantum hackers, i.e. people looking for loopholes in the system. Several such gaps, usually based on technological limitations, have already been identified. In my lecture, I describe a new kind of gap in Bell's reasoning, much more fundamental than the known technology gaps. If I am right, quantum cryptography may not have any particular advantages over plain classical cryptography.