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a(p)|q_{1},q_{2},...,q_{N}> =

[itex]\sum[/itex]^{N}_{i=1}(2pi)^{3}2E_{p}\delta^{(3)}(p-q_{i})x|q_{i},...,q_{i-1},q_{i+1},...,q_{N}>

I'm pretty sure you have to turn the ket into a series of creation operators acting on the vacuum |0>, but then not sure what relations need to be invoked for it to be clear.

Any help would be appreciated.

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# Annihilation operator acting on a Fock state

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