From: *Brent Meeker* <[email protected] <mailto:[email protected]>>
On 4/26/2018 7:16 PM, Bruce Kellett wrote:
On 4/26/2018 5:55 PM, Bruce Kellett wrote:
From: *Brent Meeker* <[email protected]
<mailto:[email protected]>>
On 4/26/2018 3:41 PM, Bruce Kellett wrote:
My point was that if there is a record that a measurement was made,
something irreversible has been extracted from the experiment. If
the QC is "conscious", then it has to interact with something to
make this irreversible record, so its quantum state is irreversibly
changed. But you are probably right: if there is no decoherence,
then there is no consciousness, since consciousness involves
irreversible memory.
There are experiments already performed in which the welcher weg is
available but is erased, even spacelike relative to detection
I know. But no information was extracted from the welcher weg photons
before they were erased. I.e., no consciousness "recorded" which way
and then forgot the result. I think the act of recording the result,
by a consciousness or anything else, is inherently irreversible. If
no record is made, then erasure is perfectly possible. Just knowing
that there were welcher weg photons that have been erased is not
quite the same thing.
But that's my question: Why isn't it the same? And even if it's not
how would be know? The "conscious" quantum computer assures us that
it not only detected that there was a welcher weg photon but that it's
weg was known to the "consciousness" of the quantum computer, before
it was erased. But why would we believe it? We already have these
experiments in which we know the weg was available and could have been
recorded, but was erased. So what is the "consciousness" that adds a
secret-sauce to the experiment?
Good question. I doubt that you can fool quantum mechanics by calling it
"consciousness". I think in this case the interaction with the welcher
weg photon would amount to sufficient decoherence -- basically
information was extracted that was not restored. Also, of course, if the
QC "forgets" what it did, how can it report on the fact that it did
anything. How can we believe that it actually knew which slit at some point?
Bruce
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