On 8/19/2018 3:05 AM, Bruno Marchal wrote:
On 17 Aug 2018, at 21:30, Brent Meeker <meeke...@verizon.net> wrote:
On 8/17/2018 2:22 AM, Bruno Marchal wrote:
We need to do that, because Alice has the choice of which base to use when
measuring her particle. That will localise her in different branches: so they
all have to exist prior to the measurement.
Those different branches don't exist. Alice's choices are not rotationally
symmetric. She is not existing in a superposition of possible measurement
choices. Her brain is, by mechanism, a classical computer.
Of course, but which superposition? People interpret ud-du by a superposition
of ud with du, but it can be seen as superposition like u’d -d’u, et Alice can
choose the partition of the multiverse,
Those are just representations of the wf in different bases. Alice's
choice of measurement axis is a classical choice. Even if there is some
quantum random number generator that Alice relies on for setting the
detector angle, it is still in a classical world because the rng result
must be amplified and decohered so that the detector can be rotated in a
classical world branch.
which is indeed greater that any simple superposition. You need to add perhaps
that the prediction is independent of the base, and that follows from Everett
theory.
We just don’t share the interpretation of the universal wave. But your’s and
Bruce remains quite unclear to me, and seem to impose some favorite base,
which, especially in this case, cannot work, or Alice becomes overdetermined or
superdetermined (which I doubt).
I only assert that Alice chooses a basis, a detector orientation, in
which to measure, and that this choice is in a particular classical
world, i.e. a branch of Everett's multiple worlds, and the same branch
in which she will meet Bob and compare notes.
Brent
Bruno
Brent
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