Quantum entanglement and spooky action at a distance

This video will challenge students. It shows how particle spins of entangled particles and employing the conservation of angular momentum, can be used to solve a problem that Einstein found rather frustrating. The problem: If we measure the spin of one of the particles we automatically know the other, because it will be opposite. This can only be the case if information from one particle travels to the other faster than light, or (as Einstein preferred) the particles have a hidden information that is only released when they are measured. An experiment by John Bell provides an answer.

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