Strongly interacting photons in 2D waveguide QED
- URL: http://arxiv.org/abs/2312.07668v3
- Date: Wed, 17 Apr 2024 13:48:51 GMT
- Title: Strongly interacting photons in 2D waveguide QED
- Authors: Matija Tečer, Marco Di Liberto, Pietro Silvi, Simone Montangero, Filippo Romanato, Giuseppe Calajò,
- Abstract summary: One dimensional confinement in waveguide Quantum Electrodynamics (QED) plays a crucial role to enhance light-matter interactions.
We demonstrate the occurrence of long-lived two-photon repulsive and bound states with genuine 2D features.
Our findings provide a paradigmatic signature of the presence of strong photon-photon interactions in 2D waveguide QED.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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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