arxiv.org/abs/2509.03970 A Diagrammatic Method for Non-Gaussian Photon Correlations in Weakly Coupled Atomic Ensembles
The authors build a scattering-theory formalism using a perturbative diagrammatic expansion, predicting that a resonantly driven ensemble of atoms, weakly coupled to an optical mode, can produce non-Gaussian photon correlations. They derive an optical-depth-dependent bound on truncation error and benchmark it against simulations.
