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He described a diabolical contraption in which a feline would become entangled with a single atom. The system would be described by a wavefunction representing at the same time the cat alive with the atom excited and the cat dead with the atom back in its ground state after its decay emission has triggered a lethal device. Quantum experts will object that a cat is a complex and open system which cannot, even at the initial time of this cruel experiment, be described by a wavefunction. The metaphor, nevertheless raises an important question: Why and how does quantum weirdness disappear in large systems? (it) |
