On 12/2/2024 6:16 AM, John Clark wrote:
On Mon, Dec 2, 2024 at 7:11 AM Alan Grayson <[email protected]>
wrote:
/> Why should I read Deutsch? I've read enough of his stuff to
know he's totally deluded in his MW dream. With MW you won't even
know that slit experiments result in interference patterns. AG/
*It's odd you should mention the two slit experiment because back in
1986 in his excellent book "/The Ghost in the Atom/" David Deutsch
proposed a way to test if Everett's Many Worlds idea is correct, and
it involves the two slit experiment. It would be difficult (not
impossible) to perform but Deutsch argues that it's not Many Worlds
fault because the reason the experiment is so difficult is because the
conventional view says conscious objects obey different laws of
physics than non-conscious objects and Many Worlds says they do not,
so to test who's right we need a mind that uses quantum properties.*
*I**n Deutsch's experiment, to prove or disprove the existence of many
worlds other than this one, an**intelligent (and
presumably conscious) quantum computer shoots electrons at a metal
plate that has 2 small slits in it. It does this one at a time. The
quantum computer has detectors near each slit so it knows which slit
the various electrons went through. The quantum mind now signs a
document for each and every electron saying it has observed the
electron and knows which slit they all went through. *
*It is very important that the documents do _NOT_ say which slit the
electrons went through, they only say it went through _one and only
one slit_ and the mind has knowledge of which one. Now _AFTER_ the
electron has passed the slit butjust _BEFORE_ the last electron hits
the plate, the mind uses quantum erasure to completely erasethe memory
of what slits all the electrons went through, but all other memories,
including all the signeddocuments, remain undamaged. *
*Then after thousands of electrons have been observed and all
which-way information has been erased, develop the photographic plate
and look at it. If you see interference bands then the Many World
interpretation is correct. If you do not see interference bands then
there are no worlds but this one and the conventional interpretation
is correct.*
*Deutsch is saying that in the Copenhagen interpretation when the
results of a measurement enters the consciousness of an observer the
wave function collapses, in effect all the universes except one
disappear without a trace so you get no interference. *
Which is clearly what would happen unless consciousness of an event does
not involve decoherence. Since brains are hot and wet this is highly
unlikely.
Brent
*In the Many Worlds model all the other worlds will converge back into
one universe when the electrons hit the photographic film because the
two universes will no longer be different (even though they had
different histories), but their influence will still be felt. In the
merged universe you'll see indications that the electron went through
slot X only and indications that it went through slot Y only, and
that's what causes interference.*
*
*
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
gia
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