On Mon, Feb 24, 2020 at 12:00 AM Bruno Marchal <[email protected]> wrote:
> On 22 Feb 2020, at 05:37, Bruce Kellett <[email protected]> wrote: > > > I am not sure that I completely understand what Zurek has done here. The > problem of carrying the initial amplitdues through a sequence of repeated > trials is opaque to me. > > > It seems to me that this is a direct consequence of the linearity of the > tensor product. > > I interpret for example the 1/sqrt(2) in a superposition as describing an > infinity of accessible histories, where I can access some particle state > (and eigenvalue) with a probability one half. If I make a measurement, that > “1/sqrt(2)” is inherited by the state describing me + that particle. > > I me> (1/sqrt(2) a + 1/sqrt(2) b) = 1/sqrt(2) Ime>Ia> + 1/sqrt(2) Ime>Ib>. > The weigth of a has passed on me, by linearity/unitarity. > Sure, you can write 1/sqrt(2) in front of each term. But the relative state in each case is the |me>, and that does not depend on the leading coefficient. When you, in a single trial, see |up> (i.e., the state is |me, who sees up>), how does that depend on the 1/sqrt(2)? From the first person perspective, remember -- do not mix in your 3p opinions. Bruce > > Bruno > > > > > > > Zurek seems to rely on the number of envariant environmental states > somehow. I will have to look into this further: it all needs a little > untangling. I can't quite see how the weights carry through repeated > measurements -- the state is surely a new state in each branched world. > > 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/CAFxXSLQ3xDwGaSg8wUEweT%3Dh%2BncYeD0MJE8jyTmn6CgPN8jhRQ%40mail.gmail.com > <https://groups.google.com/d/msgid/everything-list/CAFxXSLQ3xDwGaSg8wUEweT%3Dh%2BncYeD0MJE8jyTmn6CgPN8jhRQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > > -- > 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/7FCD6C6F-5881-4034-98A0-C1AF24207D24%40ulb.ac.be > <https://groups.google.com/d/msgid/everything-list/7FCD6C6F-5881-4034-98A0-C1AF24207D24%40ulb.ac.be?utm_medium=email&utm_source=footer> > . > -- 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/CAFxXSLQaBuqAyu7Z5c-vbe-yqR4LRnEOZJwbnZ4-sHd869TMzQ%40mail.gmail.com.
