Quantum entanglement is a phenomenon where two or more quantum particles become linked, sharing the same fate regardless of the distance separating them, so that measuring a property of one instantly influences the corresponding property of the other. This "spooky action at a distance," as Einstein called it, means their states are interconnected, and if one is measured as "spin-up," the other is instantly known to be "spin-down," even if they are light-years apart.

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