Quantum probabilities as Bayesian probabilities

A general framework for interpreting all quantum probabilities as subjective is presented. First, Gleason's theorem is used to show that any subjective quantum probability assigment must have the form of the standard quantum probability rule. Following this, a version of the Dutch-book argument is employed to show that in the case of maximal information, there is a conceptually simple connection between (subjective) probability and (measured) frequency. Finally, quantum-state tomography is considered.