How do we know Q entanglement exists if particles stop being entangled as soon as we observe them?
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The way we run these experiments is we prepare particles in a certain state (entangled or unentangled), allow them to do something (move through magnetic fields or arrays of mirrors or anything else we might think of), and then observe the final result. We consistently see that if we prepare entangled particles, the final result is different than if we prepare unentangled particles. Even though we can’t see the entangled state directly, we know that it is distinct in some way from unentangled states.
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