On Wed, Oct 16, 2019 at 4:49 PM 'Brent Meeker' < [email protected]> wrote:
> * > I thought you read Carroll's book. His example shows in what sense > you can erase the information after the photon has hit the screen.* > If you wait to erase the which way information until after the photon has hit the screen then the experiment would be much easier to perform, but the results of it are obvious and rather dull, you would see interference bands because there would be ambiguity over which slit the photon went through. The more interesting thing to do is to make the decision on whether to erase the which way information or not to erase it until after the photon passes the slits but before it hits the screen; it turns out that if you decide to not erase the information then you don't get a interference pattern, but if you decide to erase it then you do get a interference pattern. And that exparament has already been performed and yes the results are weird because the decision to erase or not to erase the information was made long after, even billions of years after, the photon passed the slits so you might think it would make no difference as far as the picture on the screen is concerned, but it does. And I think all of this is super interesting, *but* it is *not* the experiment Deutsch proposed. And you still haven't told me what your best guess is that Deutsch will find when he develops that all important photographic plate; will he see interference bands or no interference bands? I've already told you how I'd place my money. 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 view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv1d6pgRf7Tek3jyvgrMQxO-AKSwrZDi_aX%2BS7jHgmNdEQ%40mail.gmail.com.
