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Simplified model of light-matter interactions using particle detectors

Published on:

8 February 2024

Primary Category:

Quantum Physics

Paper Authors:

Erickson Tjoa,

Finnian Gray

Bullets

Key Details

Connects Unruh-DeWitt model to the spin-boson model

With modifications, spin-boson ground state results can apply

For massless fields, common smearings regulate UV but not always IR

Joint Hilbert space not always tensor product of subsystems

Discusses conditions to avoid IR problem using operator algebras

AI generated summary

Simplified model of light-matter interactions using particle detectors

This paper connects the Unruh-DeWitt particle detector model to the spin-boson model from quantum optics. It argues that common choices of smearing functions regulate ultraviolet behavior but can still exhibit infrared divergences in the massless case. This implies the joint Hilbert space cannot be described by the tensor product of the detector and field spaces. Conditions are discussed under which this problem does not arise, highlighting the relevance of operator-algebraic techniques for understanding particle detector models.

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