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A tale of two detector models: Causal structure and measurements in quantum fields

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A tale of two detector models: Causal structure and measurements in quantum fields
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30
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Release Date2021
LanguageEnglish

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Abstract
We will discuss how relativistic causality and covariance play a role in the measurement problem in quantum fields and even in our ability to put information into a quantum field. We will compare the Fewster-Verch formalism with the Unruh-DeWitt-like (UDW) particle detector models. We will discuss the limitations of both measurement frameworks as well as the typical abuses that are often made with Unruh-DeWitt-like detector models and how they matter in general relativistic scenarios. Finally we will discuss the claim in [arXiv:2103.13400] that weakly coupled detectors cannot harvest entanglement and show what is the effect of that claim, if any, on the feasibility of entanglement harvesting with particle detectors.
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German
German
English
English