On 12/14/2017 6:27 PM, Jason Resch wrote:
*I don't see how Wigner's friend presents a problem for
Copenhagen. According to the CI, the wf collapses when the system
measured, which is when the box is opened. What am I missing? The
issue of the cat's memory is a different matter, problematic IMO. AG
*
The problem is according to the CI, an isolated system evolves
according to the Shrodinger equation, and therefore does not
collapse. But it also says observation causes collapse.
That is not CI. CI always supposed there is a classical realm in which
measurements and observations were made by classical devices. Wigner
toyed with the idea that consciousness was required, but that was never
Bohr's idea of CI. In a sense, decoherence filled in CI by providing
the mechanism of collapse.
Brent
So when you have a conscious observer who is himself part of an
isolated system, from the point of view of another conscious observer,
which rule wins?
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