On Tue, Apr 19, 2022 at 11:09 AM Brent Meeker <meekerbr...@gmail.com> wrote:
> On 4/17/2022 1:45 PM, George Kahrimanis wrote: > > Just as in Schroedinger's famous example with the cat, you need a "box" > and an observer outside, in order to make sense of the cat being in an > entangled superposition. Instead of a superobserver, we can do with an > impersonal quantum description (in any chosen frame of reference), if you > prefer. > > > The only purpose of the box in Schroedinger's thought experiment was to > put off the observers perception. Really the thought experiment is over > when the radioactive decay occurs. That atom has transitioned to a > different nuclear state which is entangled with and recorded in the > environment. > Yes. Schrodinger had the cat in a box to emphasize the idea that the cat was in a macro-superposition of alive/dead. This misled Wigner to the extent that he thought the state collapsed only when the box was opened. All of this was made redundant when it was realized that decoherence rendered the state definite almost instantaneously. Saibal makes the same mistake when he claims that Alice, after her measurement, is still in a superposition until Bob sees her result. The idea that the superposition still exists since decoherence is only FAPP is something of a red herring -- in MWI, Alice has branched according to her result into up and down branches that no longer interfere. There is no macro-superposition. 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLSajQ3P9Yx4dpPxVSPetkOLBE_VY0cYU%2B5646QOOqacnw%40mail.gmail.com.
