On Tue, Oct 25, 2022 at 6:14 PM Bruce Kellett <[email protected]> wrote:
*> That is as much mumbo-jumbo as anything in Copenhagen. For instance, > what determines if the difference between the worlds is small 'enough'?* If only a tiny change has been made then it's not unlikely that another tiny change can change it back, but the more changes that occur the less likely it is that will happen. It's rather like thermodynamics, if you watch a movie of just 2 pool balls colliding you can't tell if the movie is running forwards or backwards, but if you watch a movie of a pool ball hitting 10 pool balls arranged in a geometrical pattern then it's easy to tell if the movie is running forwards or backwards. The more changes there are between the 2 universes the less likely it is for them to merge back together again, and the changes multiply very rapidly, that's why performing these sorts of quantum experiments are difficult. > *> You are using the result of no divergence between worlds to conclude > something about a divergence that probably never occurred. It is simpler to > state that no measurement was made in the Deutsch set-up. Measurement, > after all, involves irreversible decoherence, and such cannot be 'quantum > erased'. So no which-way measurement would have been made in the Deutsch > experiment.* If no which-way measurement has been made then how do you explain the document that swears that such a measurement HAD been made? John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis> dah 73v -- 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/CAJPayv31JKbcqOT%2B2McdMrU%2BBMK5%3DnkV4bhxOx7awbug1s11oA%40mail.gmail.com.
