On Tuesday, October 15, 2019 at 5:29:21 PM UTC-5, Philip Thrift wrote: > > > > On Tuesday, October 15, 2019 at 4:14:39 PM UTC-5, John Clark wrote: >> >> On Tue, Oct 15, 2019 at 1:50 PM 'Brent Meeker' < >> [email protected]> wrote: >> >>> >> * > Curiously, Deutsch used a quantum computer in a thought experiment to >>> prove multiple worlds.* >> >> >> He did indeed, I read about it 30 years ago in Deutsch's book "The Ghost >> In The Atom" and that was when I started to take the MWI seriously. >> Deutsch's test would be very difficult to perform but the reason it's so >> difficult is not the Many World's 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 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 a 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 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 any photon went through, it only says that they went >> 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. >> >> John K Clark >> > > > But the path integral is both interpretation of quantum computing - > https://arxiv.org/abs/quant-ph/0607151 (2006) - and algorithm for the > Google quantum computer simulator - https://arxiv.org/abs/1807.10749 > (2018). The Google quantum computer paper does not mention "many worlds". > > @philipthrift >
No it is not. I have worked a derivation of a path integral here before. If I have to I will do it again. There is nothing in a path integral outside of plain vanilla QM or QFT. Dowker and others start to assign ontological meaning to paths and the rest and launch into interpretation. LC -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/531506a1-c84a-4dd0-b2df-683d4b55d537%40googlegroups.com.
