Characterizing entanglement dynamics in QED scattering processes

Quantum Physics [Submitted on 11 Apr 2026] Characterizing entanglement dynamics in QED scattering processes Massimo Blasone, Silvio De Siena, Gaetano Lambiase, Bruno Micciola, Kyrylo Simonov We study entanglement dynamics among helicity degrees of freedom in quantum electrodynamics (QED) scattering processes. For generic initial states, we consider scattering at fixed momentum, corresponding to a generalized measurement described by a positive operator-valued measure, resulting in a post-measurement state. Such processes are modeled in terms of quantum maps, whose spectral structure fully determines the associated entanglement dynamics. For scattering involving fermions only, maximal entanglement present in the initial state is always preserved. Moreover, iterating the corresponding quantum maps on arbitrary initial states, we obtain the fixed points of the maps, which, in the largest number of cases, are asymptotic (pure) maximally entangled states. The structure of the maps also accounts for the entanglement dynamics in processes involving both fermions and photons. The defining properties of these maps originate from discrete symmetries of the QED interaction. Comments: 7 pages, 4 figures. Partially overlaps with arXiv:2505.06878 Subjects: Quantum Physics (quant-ph); High Energy Physics - Phenomenology (hep-ph) Cite as: arXiv:2604.10136 [quant-ph]   (or arXiv:2604.10136v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.10136 Focus to learn more Submission history From: Massimo Blasone Prof [view email] [v1] Sat, 11 Apr 2026 10:04:44 UTC (550 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 Change to browse by: hep-ph References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)