The quantum bit commitment theorem

Details The quantum bit commitment theorem The quantum bit commitment theorem

2000-07-25

arxiv.org/abs/quant-ph/0007090v4

Found. Phys. 31 (2001) 735

Physics

Quantum Physics

LaTeX, 25 pages. Forthcoming in Foundations of Physics, May 2001

Scientific paper

Unconditionally secure two-party bit commitment based solely on the principles of quantum mechanics (without exploiting special relativistic signalling constraints, or principles of general relativity or thermodynamics) has been shown to be impossible, but the claim is repeatedly challenged. The quantum bit commitment theorem is reviewed here and the central conceptual point, that an `Einstein-Podolsky-Rosen' attack or cheating strategy can always be applied, is clarified. The question of whether following such a cheating strategy can ever be disadvantageous to the cheater is considered and answered in the negative. There is, indeed, no loophole in the theorem.

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