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Maybe I should put it this way... what do we gain by accepting qbism? For example, accepting many-worlds gives parsimony of postulates. The number of postulate

Maybe I should put it this way... what do we gain by accepting qbism? For example, accepting many-worlds gives parsimony of postulates. The number of postulates goes down, because the Born rule is derived from decoherence and unitarity instead of being postulated from directly. Accepting a collapse interpretation gives easy translation between theory and practice. You don't have to justify squaring the amplitudes, you just do it and it works. Accepting a pilot-wave interpretation gives you deterministic rules and an exact single state. Accepting a qbism interpretation gives you...?

n4r9 10y ago
Well, one answer is that it resolves the measurement problem, and variants like Wigners friend, in a coherent way and without the additional issues posed by those other interpretations (although collapse interpretations aren't quite "interpretations" in the same sense). As I understand it - being neither an expert or advocate, just interested in quantum foundations - the QBist attitude is that all those no-go theorems point to quantum theory being little more than a dutch book of the universe. The whole idea is you're barking up the wrong tree if you want to give a direct physical meaning to the quantum state. If you're already welded to the notion that a quantum state corresponds to an external reality then you'll probably never find QBism very satisfying. And that's fair enough. Don't get me wrong here - what you're saying is a very valid criticism and probably what most people have against QBism. I myself find it difficult to see what value it adds, unless you already have a certain approach to scientific knowledge. I was just trying trying to clarify some of the points your original post made. There is a lot of literature about how QBism relates to various results and other interpretations. Chris Fuchs' own writings are very entertaining and worth a read.
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n4r9 10y ago

Well, one answer is that it resolves the measurement problem, and variants like Wigners friend, in a coherent way and without the additional issues posed by those other interpretations (although collapse interpretations aren't quite "interpretations" in the same sense). As I understand it - being neither an expert or advocate, just interested in quantum foundations - the QBist attitude is that all those no-go theorems point to quantum theory being little more than a dutch book of the universe. The whole idea is you're barking up the wrong tree if you want to give a direct physical meaning to the quantum state. If you're already welded to the notion that a quantum state corresponds to an external reality then you'll probably never find QBism very satisfying. And that's fair enough. Don't get me wrong here - what you're saying is a very valid criticism and probably what most people have against QBism. I myself find it difficult to see what value it adds, unless you already have a certain approach to scientific knowledge. I was just trying trying to clarify some of the points your original post made. There is a lot of literature about how QBism relates to various results and other interpretations. Chris Fuchs' own writings are very entertaining and worth a read.

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