On 7/4/2021 1:29 PM, John Clark wrote:
On Sun, Jul 4, 2021 at 3:36 PM 'Brent Meeker' via Everything List
<[email protected]
<mailto:[email protected]>> wrote:
>> I think I mentioned before that in David Deutsch's book "The
Ghost In The Atom" he proposed an experimental test that would
be very difficult, but not impossible, to performthat could
decide between Copenhagen and Many Worlds; and the reason it's
so difficult is not Many Worlds fault, the reason is that the
conventional view says 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 propertiesand
algorithms. An intelligent quantum computer shoots photons at
a metal plate one at a time that has 2 small slits in it, and
then the photons hit a photographic plate. Nobody looks at the
photographic plate till the very end of the experiment. The
quantum mind has detectors near each slit so it knows which
slit the various photons went through. After each photon
passes the slits,but before they hit the photographic
plate,the quantum mind signs a document saying that it has
observed each and every photon and knows which slit each
photon went through. It is very important that the document
does NOT say which slit a photon went through, it only says
that itwent through one slit and only one slit and the mind
has knowledge of which one. There is a signed document to this
effect for every photon it shoots.Now the mind uses quantum
erasure to completely destroy its memory of which slit any of
the photons went through; the only part remaining in the
universe is the document which states that each photon went
through one and only one slit and the mind (at the time) knew
which one. Now 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 quantum interpretation is correct.This works
because 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 because information on which slit the various
photons went through was the only thing that made one universe
different from another, so when that was erased they became
identical again and merged, but their influence will still be
felt, you'll see ambiguous evidence that the photon went
through slot A only and ambiguous evidence it went through
slot B only, and that's what causes the interference pattern.
/> And it doesn't work because it assumes that which-way can be
both observed and yet quantum erased. That's contrary to
decoherence theory of "observed"/
I don't know what you're talking about. An intelligent quantum
computer is perfectly capable of creating a document specifying that
at a certain time it had information in its memory banks that
indicated which slot a photon went through but not actually mentioning
which slot it was,
That's the step that I doubt can be implemented within QM. Of course it
can record quasi-classically (so it can be read out) every time it
detects a which-way and it can maintain a count of them. But it isn't
conscious of the which-way values, only that they were counted. So the
interference pattern showing up at the end doesn't do anything to
invalidate Copenhagen or similar interpretations.
and at a later time a quantum computer is also capable of using
quantum erasure to remove that which way information from its memory
banks so there no longer exists information anywhere about which slit
the photon went through, although there is still knowledge that at one
time that information was in its memory banks.
>///and assumes some magic "quantum consciousness", hiding the
problem behind a lack of definition of consciousness./
Wow, asenigmatic and bazaar as your first remark was, this one is even
more so! The entire point of this experiment is to determine if
conscious stuff operates according to the same laws of physics as
non-conscious stuff, I'm betting that they do.
So am I. Conscious stuff works by decohering quantum superpositions.
That's why you're never conscious of being in the trillions of
multiple-worlds you suppose exist.
Brent
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
lts9
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