Entanglement structure of quantum fields through local probes

Abstract

We present a framework to study the entanglement structure of a quantum field theory inspired by the formalism of particle detectors in relativistic quantum information. This framework can in principle be used to faithfully capture entanglement in a QFT between arbitrary-shaped regions of spacetime without encountering UV divergences, bypassing many of the issues typically present in other approaches. Our results also establish the limits of the efficiency of entanglement harvesting, and may also be used to motivate an operational definition of entanglement between spacetime subregions in field theory.

22 pages, 7 figures. RevTeX 4.2. V2 updated to match published version

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• Particle Detectors from Localized Quantum Field Theories
• Non-perturbative method for particle detectors with continuous interactions
• Particle detector models from path integrals of localized quantum fields
• Duality between amplitude and derivative coupled particle detectors in the limit of large energy gaps
• Toward a physically motivated notion of Gaussian complexity geometry
• Harvesting stabilizer entropy and non-locality from a quantum field
• Localizing quantum fields with time-dependent potentials