Relativistic time-of-arrival measurements: predictions, post-selection and causality problem

• URL: http://arxiv.org/abs/2210.05591v1
• Date: Tue, 11 Oct 2022 16:24:39 GMT
• Title: Relativistic time-of-arrival measurements: predictions, post-selection and causality problem
• Authors: Charis Anastopoulos and Maria-Electra Plakitsi
• Abstract summary: We analyze time-of-arrival probability distributions for relativistic particles in the context of quantum field theory (QFT) We show that QFT leads to a unique prediction, modulo post-selection, that incorporates properties of the apparatus into the initial state. We discuss possible ways to restore causality, and we argue that this may not be possible in measurement models that involve switching the field-apparatus coupling on and off.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We analyze time-of-arrival probability distributions for relativistic particles in the context of quantum field theory (QFT). We show that QFT leads to a unique prediction, modulo post-selection that incorporates properties of the apparatus into the initial state. We also show that an experimental distinction of different probability assigments is possible especially in near-field measurements. We also analyze causality in relativistic measurements. We consider a quantum state obtained by a spacetime-localized operation on the vacuum, and we show that detection probabilities are typically characterized by small transient non-causal terms. We explain that these terms originate from Feynman-propagation of the initial operation, because the Feynman propagator does not vanish outside the light-cone. We discuss possible ways to restore causality, and we argue that this may not be possible in measurement models that involve switching the field-apparatus coupling on and off.

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