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Hello! I read that the Klein-Gordon field can be viewed as an operator that in position space, when acted upon vacuum at position x creates a particle at position x: ##\phi(x) |0 \rangle \propto |x \rangle##. It make sense intuitively and the mathematical derivation is fine too, but I was wondering what does it physically means, as according to uncertainty principle, you can't have a localized particle. So what exactly does it mean to create a particle at position x?