On Tue, Apr 19, 2022 at 11:09 AM Brent Meeker <meekerbr...@gmail.com> wrote:

> On 4/17/2022 1:45 PM, George Kahrimanis wrote:
> Just as in Schroedinger's famous example with the cat, you need a "box"
> and an observer outside, in order to make sense of the cat being in an
> entangled superposition. Instead of a superobserver, we can do with an
> impersonal quantum description (in any chosen frame of reference), if you
> prefer.
> The only purpose of the box in Schroedinger's thought experiment was to
> put off the observers perception.  Really the thought experiment is over
> when the radioactive decay occurs.  That atom has transitioned to a
> different nuclear state which is entangled with and recorded in the
> environment.

Yes. Schrodinger had the cat in a box to emphasize the idea that the cat
was in a macro-superposition of alive/dead. This misled Wigner to the
extent that he thought the state collapsed only when the box was opened.
All of this was made redundant when it was realized that decoherence
 rendered the state definite almost instantaneously. Saibal makes the same
mistake when he claims that Alice, after her measurement, is still in a
superposition until Bob sees her result. The idea that the superposition
still exists since decoherence is only FAPP is something of a red herring
-- in MWI, Alice has branched according to her result into up and down
branches that no longer interfere. There is no macro-superposition.


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