
Contents
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10.1 What’s the ontology? 10.1 What’s the ontology?
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10.1.1 Objectivity and the classical level 10.1.1 Objectivity and the classical level
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10.1.2 Quantum states for classical objects 10.1.2 Quantum states for classical objects
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10.2 Troubles with explanation 10.2 Troubles with explanation
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10.3 Sub jective probabilities 10.3 Sub jective probabilities
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10.3.1 A Quantum Bayesian Moore’s Paradox 10.3.1 A Quantum Bayesian Moore’s Paradox
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10.3.2 The means/ends objection 10.3.2 The means/ends objection
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10.4 Conclusions 10.4 Conclusions
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10 10 Quantum Bayesianism 2: Challenges
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Published:April 2013
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Abstract
Three more substantive challenges that the quantum Bayesian faces are presented: 1) Can a sensible ontology be found for the approach? 2) Can requisite sense of quantum explanations be made? and 3) Are subjective probabilities in quantum theory really adequate? The first question is answered positively: a suitable ontological picture is provided by making use of components of Nancy Cartwright’s philosophy of science, with its emphasis on the causal powers of objects. The second two questions are shown to be more problematic, however: quantum Bayesianism would rob quantum theory of explanatory power which it nonetheless seems to possess; and trouble arises for subjective probabilities in two ways. First, quantum Bayesianism is committed to an objectionable class of statements – quantum analogues of Moore’s Paradoxes; second, it renders mysterious how the means of enquiry about the world could deliver the intended ends: coping better with the world.
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