A Why is 4-Momentum Conserved in Quantum Field Theory?

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why in QFT 4-momentum is conserved?
why in QFT 4-momentum is conserved? how can it be derived from basic principles of the Hamiltonian formalism? Is it conserved because of the golden rule?
 
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Do you know why is 4-momentum conserved in classical physics? Have you heard of the Noether theorem?
 

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