'Why the quantum?' was one of John Wheeler's 'Really Big Questions.' Several authors have recently proposed to derive quantum theory from simple axioms (
Hardy quant-ph/0101012), or from broadly information-theoretic principles (
Fuchs quant-ph/0205039, Clifton, Bub, Halvorson
quant-ph/0211089; Brukner, Zeilinger
quant-ph/0212084). Here I consider the significance of such programs for our understanding of quantum correlations.
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