Effect of the Atomic Dipole-Dipole Interaction on the Phase Diagrams of 2-Level Matter-Field Systems

Abstract:Quantum information measures are used to study the quantum phase diagrams of a two-level extended Dicke model, including the particle dipole-dipole interaction, for a finite number of particles. This is treated both with and without the rotating-wave approximation. Differences are noted between these new diagrams and those obtained in the corresponding variational treatment. The standard deviation of the population inversion operator and the correlation of the number of parti- cles occupying the ground and excited levels, carry most of the information of the regions where a phase transition takes place. The correlation coefficient of the number of photons and the number of particles occupying the excited level yields information of the sudden changes in the behavior of the ground state of the composite system.

arXiv:2603.22656 [quant-ph]

(or arXiv:2603.22656v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2603.22656 Focus to learn more arXiv-issued DOI via DataCite

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