On Sun, Apr 22, 2018 at 6:42 PM, smitra <[email protected]> wrote: *> In the MWI it is just like drawing balls from a box containing a white > and a black ball. If the two balls are sent to a distant location to Alice > and Bob, and Alice performs her measurement she'll know what Bob will find. > Here too there are two possibilities for Alice and Bob, yet two of the four > = 2 times 2 possibilities are excluded. This is a non-local effect, but an > entirely trivial one that is the result of a local common cause effect.*
That's the wrong analogy to highlight quantum weirdness, for a a better one you would would need 3 complementary properties not just 1, so in addition to white/black lets have heavy/light and radioactive/nonradioactive. With 3 complementary attributes you'd have 8 different types of balls: 1) Black heavy radioactive 2) Black light radioactive 3) Black heavy non-radioactive 4) Black light non-radioactive 5) White heavy radioactive 6) White light radioactive 7) White heavy non-radioactive 8) White light non-radioactive In secret and at random 2 balls are chosen and put in two boxes and mailed in opposite directions a very long way apart. You get one box and you can X ray your package to learn if it is black or white, or you can weigh it to learn if it is heavy or light or you can use a geiger counter on it to learn if is radioactive or nonradioactive. But you can only use one test. So if you X ray your package and find that it is black you'd expect that on average there would be 2 chances in 8 (1 in 4) that the other package contains a heavy ball; it could be white heavy and radioactive or black heavy and non-radioactive. However when this Quantum Mechanical experiment is actually performed it is found that when it is weighed on average the probability the other package is heavy is not 1 chance in 4 but is in fact 1 chance in 3. Bell's inequality says if things work according to clasical physics and common sense then it must be 1/4 or smaller, but it isn't, it's 1/3. The experiment produces a correlation between the attributes that is greater than classical physics expected, but it is exactly what quantum mechanics predicts. Thus either things are either non local and somehow X raying your package changes the attributes of the other package faster than light, or things are not realistic and so despite the name neither box can be prepackaged, that is to say neither package has any attributes at all until you X ray it or weigh it or check it with a Geiger-counter. John K Clark -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
