"Quantum entanglement describes a phenomenon where two or more quantum particles become linked, such that they are best described as a single, unified system. Even when separated by vast distances, the quantum state of one particle cannot be described independently of the other. A measurement of a property, like the spin of one entangled particle, instantaneously determines the corresponding property of the other particle, a connection Albert Einstein famously dismissed as "spooky action at a distance".
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