On Thu, Dec 14, 2017 at 4:35 PM, Bruce Kellett <[email protected]> wrote:
> > >> >> 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 M >> any >> 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. >> > >> >> Now the mind uses >> >> quantum erasure to completely destroy >> its >> memory of >> which slit any of the photons went through; t >> he 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. >> I >> f 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. 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; t >> he 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. >> I >> f 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. >> > > >* * > *I think this argument pre-dates the work by Zeh and Zurek developing the > idea of decoherence. Decoherence remove the oddities of Copenhagen as > presented above in that it is not consciousness that does the work, but > decoherence. Bohr was saying essentially the same thing (though he didn't > know the words) when he talked about the importance of the whole > experimental set up.That aside, Deutsch's idea fails because he has not > fully implemented quantum erasure. If a record exists of the fact that a > 'welcher weg' measurement was made, entanglement of the rest of the world > with the result of that measurement is not erased by merely resetting the > memory of the mind or computer. * > *So in the proposed experiment, the interference pattern is absent* > *Excellent, the two predictions are unambiguous and completely different, so Many Worlds is a falsifiable theory. There is no grey area, when that photographic plate is developed there will either be a interference pattern on it or there won't be, you predict there won't be, Deutsch and Many Worlds predicts there will be. In 20 years, maybe less, we'll know who is right.* *John K Clark* > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. 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