> On 20 Aug 2018, at 13:31, Bruce Kellett <bhkell...@optusnet.com.au> wrote:
> 
> From: Bruno Marchal <marc...@ulb.ac.be <mailto:marc...@ulb.ac.be>>
>>> On 19 Aug 2018, at 13:36, Bruce Kellett <bhkell...@optusnet.com.au 
>>> <mailto:bhkell...@optusnet.com.au>> wrote
>> 
>>> Choose a base, then you can express a superposition. That is all there is 
>>> to it. Only one superposition for the chosen (typical) basis.
>> 
>> OK. But if it is not a preferred base, then how do you interpret the 
>> superposition in the singlet state, without giving some special role to some 
>> base?
> 
> I do not give any special role to a particular basis. Alice does that by 
> choosing the orientation for her magnet.

But the reasoning should not depend on that choice.



> The interaction of that magnet with the state breaks the symmetry

In her head. 




> and gives a special role to the basis along which the magnetic field is 
> aligned.

Yes.




> This is a consequence of the interaction Hamiltonian between the magnet and 
> the spinor: the inhomogeneous magnetic field couples to the intrinsic 
> magnetic moment of the spin-half particle, so the particle moves in the 
> direction of the field -- either up or down from its forward trajectory. Read 
> my recent re-post of a discussion of this symmetry breaking interaction.

But that argument shows well that ud-du = u’d’ -d’u'. Both can be used for any 
angle chosen by Alice. Once the angle chosen, but not yet measured, Alice can 
find any result among two. By doing the measurement she locate herself in all 
the branches which her spin is down or up along that direction, with the 
corresponding Bob. The FTL is apparent only if we say that her direction is … 
typical or something. It is not, and with the many-views of the singlet state, 
we can dismiss the idea that a true action at a distance has taken place. That 
is enough to invalidate the idea that EPR-BELL requires FTL action at a 
distance (the point I tried to make to John).

Bruno





> 
> Bruce
> 
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