González Castro, IgnacioRivas Vargas, Ángel2026-01-132026-01-132025-02-25González, I., & Rivas, Á. (2025). Correlated and critical phenomena in multipartite quantum non-Markovianity. Physical Review A, 111(2), L020204.2469-992610.1103/PhysRevA.111.L020204https://hdl.handle.net/20.500.14352/130089©2025 American Physical Society. MICIN Contract No. PRE2022-101824We study non-Markovianity in the exact dynamics of two two-level atoms in a resonant cavity. We find a critical behavior in the form of a Markovian to non-Markovian transition at a finite interatomic distance and a discontinuity in the limit of infinitely close atoms. Actually, in this highly correlated regime, we find that non-Markovianity always arises if the system size exceeds a critical threshold. To this end, a nonsingular, additive non-Markovian measure with appropriate asymptotic behavior is formulated. These results show how inter-subsystem distance and system size can act as precise controls for modulating memory effects in multipartite open quantum systems.engjournal article2469-9934https://doi.org/10.1103/PhysRevA.111.L020204https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.L020204arXiv:2406.14674v2open access53530.145Quantum non-Markovian dynamicsMultipartite open quantum systemsMemory effectsMarkovian–non-Markovian transitionTeoría de los quanta2212 Física Teórica