As Max Tegmark explains in his book, Our Mathematical Universe, the reason why large-scale superposition does not exist is because of incoherence, or the fact that "observation" destroys superposition. Here, "observation" means any interaction with other particles, such as photons.
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As Max Tegmark explains in his book, Our Mathematical Universe, the reason why large-scale superposition does not exist is because of incoherence, or the fact that "observation" destroys superposition. Here, "observation" means any interaction with other particles, such as photons.