On Tue, Jul 29, 2025 at 2:37 PM Brent Meeker <[email protected]> wrote:
*>> If after the electron's encounter with the SG magnet it ever runs into >> a magnetic field again then the electron's behavior will be different than >> it would have been if it had never had an encounter with that SG magnet. >> And that is a classical record. * > > > *> No. That's why I included the diagram of the SG experiment in which > one blocks or doesn't block one side of a split beam. Until the beam hits > a detector the atoms (not electrons) are maintaining their coherence > between beams and can be recombined in a way that is impossible > classically.* > *Two points:* *1) In the above I was talking about an electron, not a beam of electrons. * *2) You say "an SG doesn't make a record; you need a detector for that". But after the electron (singular) encounters the magnetic field of the SG the electron is moving on a trajectory that is different from the one it would've had if it had no such encounter. And that is a classical record. * *> Until the beam hits a detector the atoms (not electrons) are maintaining > their coherence between beams * *I'm not sure what you mean by that. Neither an electron nor a beam of them ever encounters the atoms in a Stern–Gerlach device, the electrons only encounter a magnetic field. * *> and can be recombined in a way that is impossible classically.* *Are you talking about quantum erasure? If so I don't see the relevance except to say that's the only way you can make a detection without also making a classical record. * * John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* 6nk > -- 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 visit https://groups.google.com/d/msgid/everything-list/CAJPayv2K-_SqPRgqutnYF7qXFdvhzr7RxD8G-CG%2BB_hqtNWqsA%40mail.gmail.com.
