On 12/12/2012 9:25 AM, John Clark wrote:
On Tue, Dec 11, 2012 meekerdb <meeke...@verizon.net
<mailto:meeke...@verizon.net>> wrote:
On 12/11/2012 9:31 AM, Jason Resch wrote:
>>> Everett's QM is not a theory; it's just an interpretations.
>> Not quite. Deutsch's proposed experiment with reversible computation
and an AI
yields different results for the CI and MWI, thus they are theories which
can be
tested and differentiated.
> Except his proposed experiment relies on a hypothetical quantum computer
that is
conscious.
Yes but Deutsch argues, convincingly I thought, that the reason it's so difficult to
test is not the Many World's theory's fault, the reason is that the conventional view
says that conscious observers obey different laws of physics, Many Worlds says they do
not, so to test who's right we need a mind that uses quantum properties.
In Deutsch's experiment to prove or disprove the existence of many worlds other than
this one a 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 saying that it has observed each and every electron and knows what slit
each electron went through. It is very important that the document does not say which
slit the electrons went through, it only says that they went through one slit only, and
the mind has knowledge of which one. Now the mind uses quantum erasure to completely
destroy the memory of what slits the electrons went through. But all other memories and
the document remains undamaged.
But why should I think this is possible? I'd like to see the actual mechanism or
Hamiltonian that allows this.
And then the electrons continue on their way and hit the photographic plate. Now develop
the photographic plate and look at it, if you see interference bands then the many world
interpretation is correct.
No, it only means the 'consciousness collapses the wave-function' theory is incorrect. It
doesn't follow that MWI is correct.
Brent
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. 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
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