> On 8 Aug 2019, at 18:41, 'Brent Meeker' via Everything List 
> <everything-list@googlegroups.com> wrote:
> 
> 
> 
> On 8/8/2019 1:42 AM, Bruno Marchal wrote:
>>> Do you not see that there is only one intermediate state  and the 
>>> superposition is an artifact of expressing the state relative to a certain 
>>> basis?
>> 
>> If it was an artfifact, one photon would not been able to interfere with 
>> itself, and there would be no Bell’s violation.
> 
> It's an artifact of expressing the photon as a superposition of two bases 
> |left slit> and |right slit> which are not orthogonal. There is still only 
> one state, one wave function.

One state? One wave function? OK. But that one state and its evolution still 
describes many histories, and the expression of the photon as a superposition 
is not an artfifact. The histories interfere. If the photons are in the state 
1/sqrt(2)( |left slit> -|right slit>  ) they behave differently than the crisp 
photons going only through one slit.

Bruno


> 
> Brent
> 
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