On 24 Nov 2017, at 20:32, Jason Resch wrote:
On Fri, Nov 24, 2017 at 1:15 PM, Bruno Marchal <[email protected]>
wrote:
I was just explaining that a measurement is any memorable
interaction, which is simplest to illustrate with a tensor product
of Alice (|A>)and a simple superposition. In your notation: |A> (|
UP> + |DN>) = |A> |UP> + |A> |DN> .
In the case of the singlet state, it is more subtle, as |UP>|DN> - |
DN>|UP> describes a many-worlds with Alice having a spin in any
direction, and Bob, too but the opposite relatively to each others
(the notation is misleading). We must keep in mind the rotational
invariance of the spin. So we the Alice Bob situation is more
intricate and tedious to describe.
Sometimes I referred to the simple account of this in the Everett
FAQ by Michael Clive Price, but it seems not available since some
times. We have copied the relevant details in previous discussions
though, so you might try to find it in the archives with the key
word "Michael", or something. I have unfortunately not the time
"here and now". Later perhaps. With Everett, it is important to
reason independently of the bases in between the measurements.
I guess you see that violation of the BI leads to "action at a
distance" if we assume a collapse, or a mono-world theory. I don't
see Bell' argument applying in the MW context, though.
Bruno
Is this the Many Worlds FAQ you were referring to?
http://www.anthropic-principle.com/preprints/manyworlds.html
Yes, that one! Thank you Jason!
I think the parts relevant to EPR, Bell Inequality and Locality (for
those interested) are Q12 and Q32.
Yes, right, and also its appendices. (Not sure why the page contains
the whole FAQ in two exemplars).
I am glad it is still available online, as it is, imo, a very good FAQ
on Everett. I just saw that M. C. Price also recall that Everett gives
a new theory, not a new interpretation. Good! Usually only logicians
see this!
Best,
Bruno
Jason
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