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• W3139275142 abstract "Many states of linear real scalar quantum fields (in particular Reeh-Schlieder states) on flat as well as curved spacetime are entangled on spacelike separated local algebras of observables. It has been argued that this entanglement can be harvested by a pair of so-called particle detectors, for example singularly or non-locally coupled quantum mechanical harmonic oscillator Unruh detectors. In an attempt to avoid such imperfect coupling, we analyse a model-independent local and covariant entanglement harvesting protocol based on the local probes of a recently proposed measurement theory of quantum fields. We then introduce the notion of a local particle detector concretely given by a local mode of a linear real scalar probe field on possibly curved spacetime and possibly under the influence of external fields. In a non-perturbative analysis we find that local particle detectors cannot harvest entanglement below a critical coupling strength when the corresponding probe fields are initially prepared in quasi-free Reeh-Schlieder states and are coupled to a system field prepared in a quasi-free state. This is a consequence of the fact that Reeh-Schlieder states restrict to truly mixed states on any local mode." @default.
• W3139275142 created "2021-03-29" @default.
• W3139275142 creator A5030133302 @default.
• W3139275142 date "2021-09-15" @default.
• W3139275142 modified "2023-09-30" @default.
• W3139275142 title "Weakly coupled local particle detectors cannot harvest entanglement" @default.
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• W3139275142 doi "https://doi.org/10.1088/1361-6382/ac1b08" @default.
• W3139275142 hasPublicationYear "2021" @default.
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