On 10/18/2019 7:39 AM, John Clark wrote:
Yes but you can't expect to learn anything if you look at the
developed photograph and then decide whether to erase the which way
information or not. If you decide to erase the information do you
imagine you will see the photograph change before your eyes??
It will change before your eyes when you partition the points into those
whose erasure measurement was left rather than right. Didn't you read
Carroll's blog explication of the experiment? Many worlds are
irrelevant to the phenomenon.
> /If the welcher weg information is quantum erased, then there will
be an interference pattern, whether or not it is a conscious
observer who is erased./
If that's the way the exparament turns out and a interference pattern
exists but Many Worlds does not exist then how do you explain the
existence of a signed document testifying that somebody observed the
photon going through one and only one slit and the he knew which one?
Inquiring minds want to know.
I want to know how the AI did the measurement and the erasure, and what
consciousness had to do with it? We could easily connect a computer to
the array of particles whose spin is used to record the welcher weg.
But how would the AI of the computer "know" those values. I think it
would have to interact with them so as to create classical records, in
which case the interference would be wiped out. On the other hand if
the AI is only required to know that the array of particles recorded the
welcher weg and then were quantum-erased by a measurement in the
orthogonal basis, it can sign the affadavit and the interference pattern
will be there implicit in the partition of the film spots according to
the result of the erasure experiment...just as Carroll describes. But
the existence of this affadavit is not mysterious. A human experimenter
who knows and understands the setup could sign an affadavit saying the
welcher weg was known and then erased.
Brent
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