Strongly Interacting Photons in 2D Waveguide QED

Matija Tecer,Marco Di Liberto,Pietro Silvi,Simone Montangero, Filippo Romanato,Giuseppe Calajo

PHYSICAL REVIEW LETTERS（2024）

Dipartimento Fis & Astron G Galilei | Sez Padova

Cited 3|Views16

Abstract

One dimensional confinement in waveguide Quantum Electrodynamics (QED) plays a crucial role to enhance light-matter interactions and to induce a strong quantum nonlinear optical response. In two or higher dimensional settings, this response is reduced since photons can be emitted within a larger phase space, opening the question whether strong photon-photon interaction can be still achieved. In this study, we positively answer this question for the case of a 2D square array of atoms coupled to the light confined into a two-dimensional waveguide. More specifically, we demonstrate the occurrence of long-lived two-photon repulsive and bound states with genuine 2D features. Furthermore, we observe signatures of these effects also in free-space atomic arrays in the form of weakly-subradiant in-band scattering resonances. Our findings provide a paradigmatic signature of the presence of strong photon-photon interactions in 2D waveguide QED.

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Key words

Strong Light-Matter Interaction

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