On 10/6/2019 1:25 AM, Bruno Marchal wrote:
On 6 Oct 2019, at 02:50, Russell Standish <[email protected]> wrote:
On Sat, Oct 05, 2019 at 09:05:49PM +1000, Bruce Kellett wrote:
On Sat, Oct 5, 2019 at 7:15 PM Bruno Marchal <[email protected]> wrote:
On 5 Oct 2019, at 07:14, Bruce Kellett <[email protected]> wrote:
On Sat, Oct 5, 2019 at 1:10 AM Bruno Marchal <[email protected]> wrote:
According to the above non-separable wave function, that means that Bob
gets only the ket |->,
That is vague. It means that Alice will access to the Bobs who get that
state, and never access to the Bobs who did not got it.
Exactly. And this is what you are required to explain. Just stating it as a
fact is not an explanation.
ISTM that this follows from the Born rule - the probability of both
Alice and Bob seeing the same spin is strictly zero.
I understand that there are problems in deriving the Born rule from
the MWI, and that derivations that purport to do so (such as mine) are
contentious (to put it politely :)). So it doesn't exactly solve the
problem, but maybe directs us toward where the solution lies.
What I do get is Bruno's point that a single world assumption turns a
nonlocal state into FTL "influence", the mechanism of which is quite
unimaginable as you point out. An argument by incredulity, as it were,
for the MWI.
ISTM the same FTL "influence" is needed to split the world into two. I
originally thought of the EPR as a split into two worlds starting from
Alice's measurement and another split into two worlds starting from
Bob's measurement and where these four worlds overlap in the future they
interact so as to produce the Bell inequalities in the future overlap.
But then I realized that whatever it is about the four worlds that
causes them to interact in this way must have originated at the
measurement events, otherwise future interactions will not be local anyway.
Brent
Exactly.
Bruno
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Dr Russell Standish Phone 0425 253119 (mobile)
Principal, High Performance Coders
Visiting Senior Research Fellow [email protected]
Economics, Kingston University http://www.hpcoders.com.au
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