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Mar 10, 2018 at 2:05 comment added freecharly This is a good explanation of entanglement!
Mar 28, 2013 at 4:02 vote accept eqb
Mar 27, 2013 at 3:13 history edited Mark Mitchison CC BY-SA 3.0
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Mar 27, 2013 at 0:41 comment added Mark Mitchison @becko Yes, thanks, that has been corrected. The question is what do we mean by "two systems", which is a fairly imprecise term in quantum mechanics. Two properties of a single particle can equally be considered "one system" with a larger Hilbert space. The point is to find a decomposition into subsystems that is natural from the point of view of macroscopic, localised observers. Usually this decomposition results from spatial separation, although you're right that it doesn't have to. The interesting nonlocal aspects only become meaningful with spacelike separation, though.
Mar 27, 2013 at 0:36 history edited Mark Mitchison CC BY-SA 3.0
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Mar 27, 2013 at 0:27 comment added a06e You need to consider two systems, but they don't need to be separated in space. For instance, you could consider two properties of the same particle.
Mar 26, 2013 at 23:45 history edited Mark Mitchison CC BY-SA 3.0
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Mar 26, 2013 at 22:42 history answered Mark Mitchison CC BY-SA 3.0