Quantum Entanglement: When particles interact, they can become “entangled,” sharing a single quantum state. Measuring one instantly determines the state of the other, even if separated by light-years. Einstein called this “spooky action at a distance.” While experimentally confirmed, it defies classical causality and locality. No information is transmitted faster than light, but the correlation is instantaneous. Interpretations vary—Copenhagen, many-worlds, pilot-wave. Entanglement underpins quantum computing and cryptography, yet its mechanism remains philosophically and physically mysterious, challenging our notions of reality and separability.
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