On 1/29/2021 5:52 AM, Bruno Marchal wrote:
If you induce decoherence by measuring at the slits, then the
interference pattern disappears -- you have certainly created a
separate "world" for each path, but these can no longer interfere.
That is part of the definition of the "worlds" that are created by
irreversible decoherence.
No problem.
So the concept of "world" is, indeed, well-defined in physics.
By giving a magic role to the observer, or its consciousness, or of
measurement. The observer can no more be a machine in that picture.
There's no magic or observer invoked. That's the function of
decoherence, which operates independent of observers or deliberate
measurement.
It might not be defined in logic or metaphysics, but this is of no
concern to the working physicist -- we know perfectly well what we
mean by "a world”.
FAPP. OK.
The goal here is to try to understand what happens.
And we can readily tell when someone is talking nonsense by claiming
that "worlds interfere statistically without interacting”.
? (That is rather standard, and pretty obvious, I would say).
Really? I've never heard of it and it seems pretty obviously nonsense
to me.
Brent
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