Field quanta- infinite in extent? [duplicate]

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confusion on quantum field theory

Are field quanta infinite in extent as stated in Art Hobsons paper? What does this even mean? I've not seen any electrons or atoms that are infinite in size?

Am I getting something wrong somewhere?

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marked as duplicate by Manishearth♦Jan 12 '13 at 14:30

he also says there energy is sometimes spread over light years? huh – lee hudson Jan 12 '13 at 13:37
Perhaps you should edit/update your earlier question (Confusion on quantum field theory) instead of asking a new one. – Wouter Jan 12 '13 at 14:16

I was thinking something like $\left|\Psi\right> = \int \mathrm{d}^d x f(x) \hat{\phi}^\dagger(x) \left|0\right>$, where $\hat{\phi}$ is a field and $f(x)$ is the spatial wavefunction. (Assuming free fields for simplicity.) – Michael Brown Jan 12 '13 at 14:24