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Quantum entanglement is a physical phenomenon that occurs when a group of particles are generated, interact, or share spatial proximity in a way such that the quantum state of each particle cannot be described independently of the state of the others.[1]
"Spooky action at a distance" — Albert Einstein, 1947
When two particles are entangled, measuring the quantum state of one instantaneously determines the state of the other, regardless of the distance separating them. This non-local correlation has been experimentally verified and forms the basis of quantum computing and cryptography.[2]