%0 Journal Article
%D 2003
%T Can quantum cryptography imply quantum mechanics? Reply to Smolin
%A Hans Halvorson
%A Jeffrey Bub
%X Clifton, Bub, and Halvorson (CBH) have argued that quantum mechanics can be derived from three cryptographic, or broadly information-theoretic, axioms. But Smolin disagrees, and he has given a toy theory that he claims is a counterexample. Here we show that Smolin's toy theory violates an independence condition for spacelike separated systems that was assumed in the CBH argument. We then argue that any acceptable physical theory should satisfy this independence condition.
%8 2003/11/11
%G eng
%U http://arxiv.org/abs/quant-ph/0311065v1
%0 Journal Article
%J Foundations of Physics
%D 2002
%T Characterizing quantum theory in terms of information-theoretic constraints
%A Rob Clifton
%A Jeffrey Bub
%A Hans Halvorson
%X We show that three fundamental information-theoretic constraints--the impossibility of superluminal information transfer between two physical systems by performing measurements on one of them, the impossibility of broadcasting the information contained in an unknown physical state, and the impossibility of unconditionally secure bit commitment--suffice to entail that the observables and state space of a physical theory are quantum-mechanical. We demonstrate the converse derivation in part, and consider the implications of alternative answers to a remaining open question about nonlocality and bit commitment.
%B Foundations of Physics
%V 33
%P 1561 - 1591
%8 2003/11/01
%G eng
%U http://arxiv.org/abs/quant-ph/0211089v2
%N 11
%! Foundations of Physics 33
%R 10.1023/A:1026056716397