%0 Journal Article
%A González Castro, Ignacio
%A Rivas Vargas, Ángel
%T Correlated and critical phenomena in multipartite quantum non-Markovianity
%D 2025
%@ 2469-9926
%U https://hdl.handle.net/20.500.14352/130089
%X We 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.
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