Relativistic Quantum Information in Detectors-Field Interactions

TL;DR

This paper reviews models of detector-field interactions in relativistic quantum field theory, emphasizing their use in quantum information tasks and contrasting perturbative and nonperturbative effects.

Contribution

It provides a comprehensive overview of detector models, highlighting the importance of nonperturbative effects and backreaction in relativistic quantum information applications.

Findings

Perturbative results are valid with proper switching effects.

Nonperturbative effects reveal backreaction influences.

Analytic expressions help understand detector-field dynamics.

Abstract

We review Unruh-DeWitt detectors and other models of detector-field interaction in a relativistic quantum field theory setting as a tool for extracting detector-detector, field-field and detector-field correlation functions of interest in quantum information science, from entanglement dynamics to quantum teleportation. We in particular highlight the contrast between the results obtained from linear perturbation theory which can be justified provided switching effects are properly accounted for, and the nonperturbative effects from available analytic expressions which incorporate the backreaction effects of the quantum field on the detector behaviour.