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In the thread Localization of Electron Matter Field Excitation in Simple Electron QFT Model a vital question about QFT is asked namely ´what keeps the electron matter field excitation localized instead of dispersing out through the extended field´. It is stated in the answer there that the coherent state describes a classical particle from point of view of QFT.

  1. This somehow answers the question but it is unclear why does Quantum mechanics not use coherent state and subsequently avoid all troubles with wave-particle duality as Schoedinger attempted in the beginning?

  2. If one measures the impulse of the the source the coherent packet should vanish instantaneously and the experimentally observed localization of the electron could not be explained with it anymore.

  3. how will coherent state manage the double slit experiment? if the packet is localized where would interference come from?

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  • $\begingroup$ In fact the coherent state was developed by Schroedinger himself - so it is a construct from QM not QFT. But nobody in QM has stated that it have any answer to the above raised questions. $\endgroup$
    – Mercury
    Commented Jan 8, 2020 at 18:07
  • $\begingroup$ Doesn't the slits filter the initial state? Why wouldn't this cause the localisation to disappear? $\endgroup$
    – acarturk
    Commented Jan 8, 2020 at 20:28

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