https://doi.org/10.1140/epjp/s13360-025-06647-9
Regular Article
Entanglement entropy of particles in a perturbative scattering
1
School of Physics and Electronics, Henan University, 475004, Kaifeng, China
2
Department of Applied Physics, College of Science, China Agricultural University, 100083, Beijing, China
Received:
5
September
2024
Accepted:
11
July
2025
Published online:
4
August
2025
The entanglement among scattering particles in an exemplary quantum electrodynamics (QED) process is studied perturbatively. To increase the computational accuracy, we need to consider virtual photon loop diagrams, which lead to infrared divergence. Therefore, when including higher-order corrections in perturbative theory, we use the dressed state formalism proposed by Chuang and Faddeev-Kulish, which provides a finite S-matrix element. The entanglement entropy calculation shows that the entanglement is distributed linearly over the scattering cross section under the perturbation approximation.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
