> On 6 Sep 2020, at 19:58, Lawrence Crowell <goldenfieldquaterni...@gmail.com> > wrote: > > This is a reasonable account of teleporation.
I agree too, … except for minor technical details (already discussed with Bruce, and I guess Bruce will not be convinced by Vaidman, nor by my slight corrections, which is mainly that a quantum state always refer to infinity of worlds/histories/relative-states). Bruno > > LC > > On Sunday, September 6, 2020 at 12:03:30 PM UTC-5 sce...@libero.it wrote: > BTW I've found that quote by Vaidman. > > 'In the framework of the MWI, the teleportation procedure does not move the > quantum state: the state was, in some sense, in the remote location from the > beginning. The correlated pair, which is the necessary item for > teleportation, incorporates all possible quantum states of the remote > particle, and, in particular, the state which has to be teleported. The local > measurement of the teleportation procedure splits the world in such a manner > that in each of the worlds the state of the remote particle differs form the > state by some known transformation. The number of such worlds is relatively > small. This explains why the information which has to be transmitted for > teleportation of a quantum state—the information which world we need to split > into, i.e., what transformation has to be applied—is much smaller than the > information which is needed for the creation of such a state. For example, > for the case of a spin-1/2 particle there are only 4 different worlds, so in > order to teleport the state we have to transmit just 2 bits.' – Lev Vaidman > in https://arxiv.org/abs/quant-ph/9810089 > <https://arxiv.org/abs/quant-ph/9810089> > > >> Il 06/09/2020 12:47 Bruce Kellett <bhkel...@gmail.com >> <applewebdata://50A0A1F1-1404-4380-96C5-FA0AE9424ABD>> ha scritto: >> >> >> On Sun, Sep 6, 2020 at 6:55 PM 'scerir' via Everything List < >> everyth...@googlegroups.com >> <applewebdata://50A0A1F1-1404-4380-96C5-FA0AE9424ABD>> wrote: >> Bruce: "The idea of a large ensemble of pre-existing worlds that just get >> distinguished by results has never been taken seriously by anyone outside of >> this list. It has never been worked through in detail, and it is doubtful if >> it even makes sense. It certainly has nothing to do with the Schrodinger >> equation." >> >> Vaidman, speaking of quantum teleportation, >> https://en.wikipedia.org/wiki/Quantum_teleportation >> <https://en.wikipedia.org/wiki/Quantum_teleportation> , pointed out that >> when Bob receives the message from Alice, he will know which of the four >> states his particle is in, and using this information he performs a unitary >> operation on his particle to transform it to the desired state. But (as >> Vaidman pointed out) before Bob receives the message from Alice there are >> four pre-existing equiprobable states, one of them (Bob doesn't know which >> one) is already the right one. >> >> >> Serafino, >> I am sorry to have to say this, but Lev Vaidman is something of an idiot >> about these things. Don't take anything he says seriously, even though he >> has been around for many years. This quote is irrelevant to my point. MWI is >> incompatible with the Born rule. The Born rule makes sense only in single >> world settings. >> >> Bruce >> >> > >> -- >> 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 everything-li...@googlegroups.com >> <applewebdata://50A0A1F1-1404-4380-96C5-FA0AE9424ABD>. > >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/everything-list/CAFxXSLTkPzTANfkGUhF1YZ74oRktqeyTwLX8dC8ktnOqPeYoqA%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/everything-list/CAFxXSLTkPzTANfkGUhF1YZ74oRktqeyTwLX8dC8ktnOqPeYoqA%40mail.gmail.com?utm_medium=email&utm_source=footer>. >> > > > -- > 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 everything-list+unsubscr...@googlegroups.com > <mailto:everything-list+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/0695c3ce-8d0b-48e5-b1a2-483a987cd64fn%40googlegroups.com > > <https://groups.google.com/d/msgid/everything-list/0695c3ce-8d0b-48e5-b1a2-483a987cd64fn%40googlegroups.com?utm_medium=email&utm_source=footer>. -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/5B31E4A5-94CF-4713-95AD-3BFC4CC54986%40ulb.ac.be.
