In quantum field theory, all particles are "excitations" of their corresponding fields. Is it possible to somehow "measure" the "value" of such quantum fields at any point in the space (like what is possible for an electrical field), or the only thing we can observe is the excitations of the fields (which are particles)?

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    $\begingroup$ Does the electromagnetic field count? $\endgroup$ – probably_someone Dec 11 '18 at 0:17

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