Effect of the Atomic Dipole-Dipole Interaction on the Phase Diagrams of Field-Matter Interactions

Quantum Physics [Submitted on 24 Mar 2026] Effect of the Atomic Dipole-Dipole Interaction on the Phase Diagrams of Field-Matter Interactions S. Cordero, E. Nahmad-Achar, O. Castaños, R. López-Peña Quantum information measures are used to study the quantum phase diagrams of the two-level Dicke model including the atomic dipole-dipole interaction, for a finite number of particles, with and without the rotating-wave approximation, which yields the conservation of the total number of excitations in the first case and its parity in the general case. We show that the quantum phase transitions can be observed in the fluctuation of the atomic populations and that of the number of photons, and also that the conditional probability distribution of the population of the excited state with zero photons carries the information of the quantum phase transitions when the matter-field interaction is weak. Comments: 12 pages, 11 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.22656 [quant-ph]   (or arXiv:2603.22656v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.22656 Focus to learn more Submission history From: Eduardo Nahmad-Achar Ph.D. [view email] [v1] Tue, 24 Mar 2026 00:19:14 UTC (12,713 KB) Access Paper: view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 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?)