Quantum Field Theory: Multiparticles and Single Particles

martyf
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In quantum field theory a field is described by a multiparticles state? And, a single particle is itself a field?
 
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In QFT, fields are operators, not states.
 
Yes I know, but fields are describe as a system of infinite harmonic oscillators, and the eigenstates of this system (eigenstates of the Hamiltonian) are multiparticle-states. So, if in this state there is only a particle, is it identified with the field?
 

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