A protocol with lattices of gapless detectors reconstructs the field's two-point function from detector correlations while correcting for finite-size effects via multipole expansion.
Kempf, Replacing the notion of spacetime distance by the notion of correlation, Frontiers in Physics9, 247 (2021)
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Non-perturbative measurements of two-point functions in quantum field theory
A protocol with lattices of gapless detectors reconstructs the field's two-point function from detector correlations while correcting for finite-size effects via multipole expansion.