From: *Bruno Marchal* <[email protected] <mailto:[email protected]>>
On 2 Aug 2018, at 01:32, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
From: *Bruno Marchal* <[email protected] <mailto:[email protected]>>
On 1 Aug 2018, at 06:19, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
No, there are not any infinities of anything. You simply confuse
yourself by continuing to claim such things which are not part of
quantum mechanics.
The singlet state just means that They will see correlated result
when coming back together. Let me put it in this way: if Alice and
Bob are space separated, I do not see how to give meaning to “to be
in the same branche”, and they might individually get non correlated
spin measurement?
It is easy to see how they can be in the same branch, even if
space-like separated. I gave an account of how all measurements are
made in the same branch by starting with the time when Alice and Bob
meet to compare notes after their series of experiments and working
backwards to show that, since neither can jump between branches, all
measurements must have been made in the same branch.
You can do the same thing in the forwards time direction by
considering that the singlet is prepared in one world.
I cannot make sense of this. Preparing a singlet state is typically
done in an infinity of “worlds” (or some very big numbers of worlds in
some version of quantum gravity, but for simplicity I assume just
“classical” QM).
It makes perfect sense if you do proper quantum theory. There is no
"infinity of worlds". As I have said, that is your private
misconception. As above, it serves only to confuse both you and the issue.
I have to go. Will read the sequel later. But it seems to me that you
constantly postulate a collapse. The notion of singlet state is
typically a many-world construction, even in Copenhagen before the
"measurement/collapse”.
You continue to confuse the rotational symmetry of the state with some
"many-worlds" conception. That is a mistake. And until you can rid
yourself of this misconception you will never make any progress. Sorry
if this seems patronizing, but you need to get these things right.
Bruce
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