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Jun 19, 2018 at 14:44 comment added alanf @MoziburUllah You seem to have some disagreement with me. If you would like to discuss that disagreement my email is [email protected].
Jun 19, 2018 at 13:25 comment added Mozibur Ullah Give it up Alan ... you might be able to fool other people with merely repeating half-digested jargon ad nauseam - but I'm afraid it doesn't fool me.
Jun 19, 2018 at 13:13 comment added alanf The electrons are entangled with respect to their spin. Each individual electron has a state that does not correspond to it having a particular spin: there is no direction in which its reduced density matrix will be |up><up| or |down><down|.
Jun 19, 2018 at 11:48 comment added Mozibur Ullah ... but a composite particle of two quarks - a meson; and as a composite particle it has total spin zero; this means when it decays into photons they will have opposite and equal spins.
Jun 19, 2018 at 11:47 comment added Mozibur Ullah but you begin your experiment with "suppose you have two electrons in a state of entangled spin"; so how can "they have no spin before" when you begin with them having spin? In fact, when a particle has spin it always has spin; it cannot not have spin; the only way this is possible is if you begin with a particle with no spin at all; that's why the comment above was interesting, because in their experiment they began with a pion which is not an elementary particle...
Jun 19, 2018 at 11:30 comment added alanf One way we know they had no spin before the measurement is that this is ruled out by experiment, as explained in my answer.
Jun 19, 2018 at 8:16 comment added Mozibur Ullah This isn't actually answering the question the OP is asking. An answer that does is actually posted under the comments to the question. It's short and it's relevant.
Jun 19, 2018 at 7:26 history answered alanf CC BY-SA 4.0