In 1936, in the same paper in which he introduced his famous cat, Erwin Schrodinger drew attention to a feature of quantum mechanics that he called entanglement. Since then entanglement – a connection between separated particles that Einstein described as "spooky" – has come to be seen as the source of much that is difficult to understand in quantum theory.

Quantum entanglement, introduced by Erwin Schrodinger in 1936, is a complex phenomenon that connects separated particles and contributes to the challenges in understanding quantum theory.

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Getting all entangled up

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