On Thu, Apr 26, 2018 at 2:02 PM, <[email protected]> wrote:

​> ​
>
> * How many times must I remind you that Feynman explained that very
> clearly.*
>

​42.​


​> ​
> *Please repeat it. AG*
>

I originally sent this on December 14 2017:

David Deutsch proposed a test of Many Worlds about 30 years ago in his book
"The Ghost In The Atom", but  it would be very difficult to perform. The
reason it's so difficult to test is not  the Many World's theory 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. Quantum Computers have
advanced enormously over the last 30 years so I wouldn't be surprised if it
or something very much like it  is actually performed in the decade or two.

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 electrons 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 any photon went through, it only says that
they went through one slit and one slit only and the mind has knowledge of
which one. There is a signed document to this effect for every photon it
shot.

Now the mind uses quantum erasure to completely destroy its memory of which
slit any of the photons went through; the only part remaining 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 indications
that the photon went through slot A only and indications it went through
slot B only, and that's what causes interference.
​

 John K Clark

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