Quantum Probability from Decision Theory?

H. Barnum, C. M. Caves, J. Finkelstein, C. A. Fuchs, R. Schack

Published 1999-07-07Version 1

In a recent paper (quant-ph/9906015), Deutsch claims to derive the "probabilistic predictions of quantum theory" from the "non-probabilistic axioms of quantum theory" and the "non-probabilistic part of classical decision theory." We show that his derivation fails because it includes hidden probabilistic assumptions.