Because the superposition is now a shared property of the system and its environment – because the quantum system has lost its integrity and exists in a shared state with all the other particles – we can’t any longer ‘see’ the superposition just by looking at the little part of it. We can’t see the wood for the trees. What we understand to be decoherence is not actually a loss of superposition but a loss of our ability to detect it in the original system. Only by looking closely at the states of all these entangled particles in the system and its surroundings can we deduce that they’re in a
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