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Feb24-12, 09:02 AM
Because if we measure particles A and X, the entanglement with B and Y is lost. So when you go to entangle B and Y, because no entanglement exists between A and B, and X and Y, A and X won't become entangled?
When we talk of teleportation, is it when we measure A, Y takes on the same polarisation?
Just remember that the *ordering* does not matter in a swapping setup. You can measure A and X before you swap the entanglement via B and Y and the results are the same. Strange but true!