Bit Commitment from Weak Non-Locality

Details Bit Commitment from Weak Non-Locality Bit Commitment from Weak Non-Locality

2005-08-31

arxiv.org/abs/quant-ph/0508233v2

Physics

Quantum Physics

This paper has been withdrawn by the authors. Superseded by arXiv:0811.3589

Scientific paper

So-called non-local boxes, which have been introduced as an idealization-in different respects-of the behavior of entangled quantum states, have been known to allow for unconditional bit commitment between the two involved parties. We show that, actually, any possible non-local correlation which produces random bits on both sides can be used to implement bit commitment, and that this holds even when the parties are allowed to delay their inputs to the box. Since a particular example is the behavior of an EPR pair, this resource allows for implementing unconditionally secure bit commitment as long as the parties cannot entangle their Qbits with any other system.

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