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<blockquote data-quote="freyar" data-source="post: 6747365" data-attributes="member: 40227"><p>Nagol is partly right --- two people at the different locations can't communicate using this kind of experiment, at least not without sending other information using normal (ie, slower than light speed) means. So there is no information transfer at all in this experiment, and there is certainly none faster than light.</p><p></p><p>But it seems like there is information transfer because there are correlations in measurements made that could not influence each other at less than light speed. Specifically, if the electron at location A "points up," the electron at B will always "point down." Or if A "points left," B will "point right." And that's true even if B couldn't possibly know the result at A if the correlation were due to information transfer at less than the speed of light. However, the weirdness of quantum mechanics isn't due to some kind of FTL semi-information transfer. The weirdness is in the way the state of the two electrons is set up in the first place (and the fact that it stays weird). You see, what we want to say is that the results of the experiment mean that either (1) the electrons have to know which way they "point" in advance or (2) there is FTL information transfer when the first electron is measured. Neither is true. But the electrons do know in advance that they always "point" oppositely (really, the math is a bit more specific), and any other statement about how they "point" is nonsensical until the measurement is made.</p><p></p><p>Incidentally, I kept putting "point" in quotes because I really mean to talk about electron spin, but that's a little esoteric. In a simplified sense, though, every electron's spin points in some direction (when it is measured).</p></blockquote><p></p>
[QUOTE="freyar, post: 6747365, member: 40227"] Nagol is partly right --- two people at the different locations can't communicate using this kind of experiment, at least not without sending other information using normal (ie, slower than light speed) means. So there is no information transfer at all in this experiment, and there is certainly none faster than light. But it seems like there is information transfer because there are correlations in measurements made that could not influence each other at less than light speed. Specifically, if the electron at location A "points up," the electron at B will always "point down." Or if A "points left," B will "point right." And that's true even if B couldn't possibly know the result at A if the correlation were due to information transfer at less than the speed of light. However, the weirdness of quantum mechanics isn't due to some kind of FTL semi-information transfer. The weirdness is in the way the state of the two electrons is set up in the first place (and the fact that it stays weird). You see, what we want to say is that the results of the experiment mean that either (1) the electrons have to know which way they "point" in advance or (2) there is FTL information transfer when the first electron is measured. Neither is true. But the electrons do know in advance that they always "point" oppositely (really, the math is a bit more specific), and any other statement about how they "point" is nonsensical until the measurement is made. Incidentally, I kept putting "point" in quotes because I really mean to talk about electron spin, but that's a little esoteric. In a simplified sense, though, every electron's spin points in some direction (when it is measured). [/QUOTE]
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