When the general public talks about quantum entanglement, they really do not ask for deep understanding. They would say: When the two particles are far apart, and the information cannot be transmitted faster than light, you measure the (spin) state of one particle and you immediately know the (spin) state of the other particle. They said this is magical: could the information be transmitted from this particle to the other at the speed of faster than light? But the problem is, if we know that the two particles are in different states (the spins are in opposite directions), and one is detected, of course we will know the other, which does not require any faster than light information transmission. It is as if two people divided a jade seal into two halves, each taking half, and traveled far away. Later when you see any one half, of course you would know that the other person has taken the other half. The key to the problem lies in the randomness of the spin directions of the two
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