> On 2 Aug 2018, at 12:54, Bruce Kellett <[email protected]> wrote:
> 
> From: Bruno Marchal <[email protected] <mailto:[email protected]>>
>>> On 1 Aug 2018, at 21:12, Brent Meeker <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> 
>>> Indeed.  But the common-cause explanation doesn't work for all choices of 
>>> measurement angle.
>> 
>> It does. Well, it does not if you assume only one Bob and Alice, but the 
>> whole point is that it does if you take into account all Alices and Bobs in 
>> the multiverse. QM explains why in all branches, Alice and Bob will see the 
>> violation of Bell’s inequality, and this without any physical instantaneous 
>> causality on a distance. The MW theory is NOT an hidden variable theory in 
>> the sense of EPR or Bohm. The MW theory is based on the first person 
>> indeterminacy, and illustrate the first person plural aspect (contagion of 
>> duplication). Hidden variable theory in the sense of de Broglie, Böhm, or 
>> Einstein incompleteness are pure 3p theories, not involving the role of the 
>> person in the picture.
> 
> In that case you have a different theory, which is not quantum mechanics. You 
> can believe anything you like about your own private theories, but you cannot 
> expect others to join in. If we are talking about quantum mechanics, then it 
> would be polite to stick to that theory.

I am talking about Quantum Mechanics without collapse. You are the one seeming 
to interpret ud + du as a superposition  of worlds with Alice having a particle 
in state u (and Bob having the corresponding particle in state d) with worlds 
with Alice having a particle in state d (and Bob having the corresponding 
particle in state u). That would contradict the rotational symmetry of the 
singlet state.

Bruno



> 
> Bruce
> 
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