On Wed, Oct 26, 2022 at 9:32 AM John Clark <[email protected]> wrote:
> 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? > No such document can exist since no measurement was made. Or, if such a document exists, it is fraudulent. Quantum erasure experiments do not prove MWI. 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/CAFxXSLSJDEfWcOyR1w%3Dc%2BUkFysb_5Vdkw4y-FaMOQgfP08df%3Dg%40mail.gmail.com.
