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up and down spin... the two sides should produce opposite spin but the order is

random.. however I'm confused by the following statements:

"Recall that when you measure an electron's spin in one direction you

erase all information about the electron's spin in any other

direction. By this I mean the following: If I measure the spin in the

left/right direction I will always find it pointing exactly left or

exactly right. Say I measure it pointing left. If I measure it again

in the left/right direction then I will definitely see it pointing

left again. If I measure it in the up/down direction, however, then I

will have 50/50 odds of seeing it point either way. Once I do that

measurement, however, I will have fixed it to be pointing either up or

down, and a left/right measurement will once again yield 50/50 odds".

What is the above talking about? By using say up detector. You can

bias the pair to *always* produce up spin in that detector? But I

thought it's supposed to be random. Hope someone can clarify.