On 5/20/2018 5:00 PM, [email protected] wrote:


On Sunday, May 20, 2018 at 10:53:38 PM UTC, Brent wrote:



    On 5/20/2018 3:35 PM, Brent Meeker wrote:

        Exactly.  The quantum Bayesian take this view


    How does "Baysian" fit into this picture? Can't one interpret the
    SWE as a representation of what we know about a system, without
    being a Baysian? AG

        and consider Schroedinger's equation also as a personal book
        keeping device of what one knows about a system and then the
        Born rule and projection operators fit neatly into the scheme
        of updating one's personal knowledge.


    I would delete "personal" from your comment. We're referring to
    the knowledge of any observer. AG

    No.  That's whole point of it being Bayesian.  The SWE is
    conceived as relative to one's personal information.  So if you
    know the electron was prepared in UP polarization and I don't, we
    will write down different states and when it goes through an SG
    measuring UP, you won't change your representation, but I will.


Then you will use an incorrect SWE. I assume there's a correct one based on objective information about the preparation state of any system. I am not a Baysian. AG

It's not a matter of being incorrect, just incomplete.  And there may be several attributes of a system such that different observers are ignorant of the values of different attributes and so they all write down different initial states and evolve different wave functions.


    If you start to regard it as "objective" and "real" you fall back
    in to the problems that led to MWI.


When does the "real" wave function collapse?  And what makes it collapse?

Brent

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