On 11/06/2017 7:14 pm, Bruno Marchal wrote:
On 09 Jun 2017, at 20:21, David Nyman wrote:
On 9 June 2017 at 12:34, Bruno Marchal <marc...@ulb.ac.be
<mailto:marc...@ulb.ac.be>> wrote:
OK. In this case, Alice choose to measure her spin. This will
only self-localized here in one (actually still aleph_0)
histories, where she will know her states, and the states of any
Bob she could soon or later interact with, but not of the
inaccessible Bobs, who might found non correlated result. yet,n
him too will be able to met only the Alice(s) having the
correlated spin.
Why?
That is due to the singlet state. [Alice Bob ( up down - down up) ]=
[Alice Bob up down - Alice Bob down up] keeps its rotational symmetry,
even after the interaction took place.
That is false. The measurement of a spin or polarization state
introduces an externally defined direction that destroys the rotational
symmetry of the original state. And in general, Alice and Bob will
introduce different external directions.
The correlation are built in by the preparation of that state, and is
valide whatever the smpin direction are, so you can add prime to up
and down, for the other direction, and the correlation does not
depends on the base, and evolve locally.
The rotational symmetry does not depend on the basis, but it does not
evolve locally since the particles move apart and no longer interact.
When space separated, they are independent, but by virtue of the
singlet state, if they do measurement, they will put themselves in
"independent" and possible different superposition, which will
'contagiate' their respective environment up to *different* partners
who will get the right correlation by the math of the singlet state
which will not allow any Alice and Bob to not confirm the singlet ,
highly correlated state.
That is just an appeal to magic.
The singlet state describe an infinity of Alice and Bob, having all
their spin being correlated,
No, it does not. There is only one Alice and Bob -- it is only the
direction in which they choose to measure the spin/polarization that is
undefined until they actually do it. Then they can only each split into
two copies in the case under discussion.
and they localoze themselves in which one when doing measurement. This
can be used to show that they will conclude that Bell's inequality is
violated, despite no influence at a distance exist. There is only
spreading superposition, and all Alice and Bob can only meet their
corresponding partners.
Sure, they can only meet their corresponding partners, but how do they
know, in your account, which partners correspond?
Bruce
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