> On 23 Apr 2018, at 01:21, John Clark <[email protected]> wrote: > > On Sun, Apr 22, 2018 at 6:42 PM, smitra <[email protected] > <mailto:[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
Common sense implies here “mono-universe”, I guess. > 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 In the sense that all outcomes exists, which is of course the MW, which is against common sense, but less than an action oat a distance, which violates already special relativity. Bruno > 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] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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.
