On Mon, Oct 21, 2019 at 4:29 AM 'scerir' via Everything List < [email protected]> wrote:
> Il 20 ottobre 2019 alle 17.57 smitra < [email protected]> ha scritto: > > Yes, Bruce is right on this point of the interference being detectable > after the photons hitting the screen by transferring the which way > information to the spins of electrons. But John Clark is right about the > main topic this discussion is about. One can construe that also in terms > of realism (I think John did mention this also some tome ago). The > traditional view is that we must abandon realism, but that leads to > paradoxes as it's problematic to then get to realism at the macroscopic > level. In principle the macroscopic world is also described by QM, and > any formalism that assumes non-realism would have to apply there at > well. The MWI solves this problem in a much better way by explaining > non-realism as an artifact of Many-World realism. The different > realities in the different Worlds makes the notion of single World > realism false. > > > Saibal > > "The experimental results demonstrate the possibility of observing both > particle-like and wave-like behavior of a light quantum via quantum > mechanical entanglement. The which-path or both-path information of a > quantum can be erased or marked by its entangled twin even after the > registration of the quantum." https://arxiv.org/abs/quant-ph/9903047 > > As for "realism" I think we need a definition. What is "real"? (Yes, I > know the EPR definition.) > Thanks Serafino. I must admit that I do not understand the reference to "realism" either. The Zeilinger group are careful to enforce Einstein's notion of locality -- by ensuring that the choice about whether to erase or not, the interference itself, and the quantum erasure of welcher-weg information, are all made at space like separations (see arXiv:1206.6578). But I do not see what realism has got to do with it, or what definition of realism is involved. 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLTC0xGNLwcQWNNdO5b98agtJCjacYxQnAFFAxfYnyBJzA%40mail.gmail.com.
