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Open Quantum Systems Decoherence
Non-perturbative measurements of two-point functions in quantum field theory
arXiv
Authors: Sebastian Holmén, T. Rick Perche
Year
2026
Paper ID
63778
Status
Preprint
Abstract Read
~2 min
Abstract Words
84
Citations
N/A
Abstract
We present a non-perturbative method through which local probes can access the two-point function of a quantum field within a region of spacetime. By considering a lattice of gapless particle detectors, we identified the probe observables that encode the field's two-point function. We quantify the discrepancies introduced by physical finite-sized interaction regions by performing a spacetime multipole expansion of the smeared two-point function. Our protocol expresses the two-point function entirely in terms of measurable detectors correlations, providing an operational notion of states in QFT.
Why This Paper Matters
- This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
- It adds a 2026 reference point for readers tracking recent quantum research.
- We present a non-perturbative method through which local probes can access the two-point function of a quantum field within a region of spacetime.
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