On Tue, Oct 22, 2019 at 1:41 AM John Clark <[email protected]> wrote:
> On Sun, Oct 20, 2019 at 6:24 PM Bruce Kellett <[email protected]> > wrote: > > *> It seems that you think you will just see Young's interference fringes >> whatever you do *after* the record is made at the screen. But that is >> false,* >> > > Like hell it is! Do you actually think Zeilinger and other experimental > physicists claim they can make a photograph change before your eyes AFTER > it has been taken like something out of Back To The Future? It was a fun > movie but that's not the way things work. > >> >> > as has been demonstrated in many experiments. >> > > That statement is worse than false, you're talking logical nonsense. The > photograph itself contains which way information, if the photo has no > interference pattern then you know the photon went through one and only one > slit, and if it does have a interference pattern then you know the photon > went through both slits. So if you have the ability and really and truly > want to destroy the which way information *AFTER* the photon hits the > photographic plate (or screen) then you MUST destroy the photograph too and > do so before anybody looks at it. In 1801 Thomas Young was not a fool and > that's why he had no desire to destroy his screen *BEFORE *he looked at > it, and that's why he saw a interference pattern; but it's true if he had > he would have not seen a interference pattern, he would not see anything at > all because there would be no screen to look at because he destroyed it. > All your ranting does nothing to enhance your credibility. I quote from the Xiao-song Ma et al. paper (Zeilinger group): "The authors proposed to combine the delayed-choice paradigm with the quantum erasure concept. Since the welcher-weg information of the atoms is carried by the photons, the choice of measurement of the photons -- either revealing or erasing the atoms' welcher-weg information -- can be delayed until 'long after the atoms have passed' the photon detectors at the double slit. The later measurement of the photons 'decides' whether the atoms can show interference not even after the atoms have been detected. This seemingly counter-intuitive situation comes from the fact that in a bipartite quantum state the observer correlations are independent of the space-time arrangement of the measurements on the individual systems." In reference to the 144 km Canary Island experiments, they say: "The other arrangements such that the choice event happens approximately 450 microseconds after the events I_s (recording of interference or not at the screen) in the reference frame of the source, which puts a record to the amount of delay by more than 5 orders of magnitude to the previously recorded quantum eraser experiment." There is no doubt that they make the choice of whether or not to erase the welcher-weg information 450 microsecs *after* the photons hit the screen and are irreversibly recorded. You clearly do not know what your are talking about..... 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/CAFxXSLSWAE%3D2iG8AMG4_HsYM%2BuQM25ThfhL8e0grRH-gpZmNCA%40mail.gmail.com.
