Reading through David Tong lecture notes on QFT.(adsbygoogle = window.adsbygoogle || []).push({});

On pages 43-44, he recovers QM from QFT. See below link:

[QFT notes by Tong][1]

[1]: http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf

First the momentum and position operators are defined in terms of "integrals" and after considering states that are again defined in terms of integrals we see that the ket states are indeed eigen states and the eigen values are therefore position and momentum 3-vectors.

What is not clear to me is the intermediate steps of calculations not shown in the lecture notes, in particular, the computation of integrals involving operators as their integrand, to obtain the desired results.

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# Recovering QM from QFT

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