Re: MWI, Copenhage, Randomness

From: scerir <scerir.domain.name.hidden>
Date: Thu, 5 Sep 2002 19:28:54 +0200

> Yes, this is similar to the "Wigner's friend" thought-experiment.

Wigner later (1983) changed opinion and wrote
that decoherence forbids superposition of states like
     c1 |s 1> |friend 1> + c2 |s 2> |friend 2>
After that in QM the "conscious" being - i.e. the "friend"
who tells that he already "knows" whether the outcome is
|s 1> or |s 2> - plays no role. Von Neumann, London,
Bauer, Wigner thought (and many more still think) that
consciousness was able to "collapse" a superposition
(E.P.W., Collected Papers, VI, pages 225-244)
s.
Received on Thu Sep 05 2002 - 10:24:04 PDT