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Spectrally broadened ensembles of rare-earth ions embedded in optical waveguides offer a powerful platform for realising practical on-chip optical elements with applications to quantum information and enjoy a long-established experimental toolbox. Studies into the (quantum) optical properties and ensemble dynamics of spectrally inhomogeneous emitters in the framework of waveguide QED are lacking, despite much focus in the context of cavity QED. In this work, we show that strong coupling of cavity QED can be simulated using waveguide-based ensembles, and analyse their linear and nonlinear optical response. The work further establishes waveguide-based ensembles as a fruitful platform for quantum information.
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Lewis Ruks, Victor Manuel Bastidas, William J. Munro, "Coherent dynamics of inhomogeneously broadened ensembles in waveguide QED," Proc. SPIE PC12746, SPIE-CLP Conference on Advanced Photonics 2023, PC1274604 (4 October 2023); https://doi.org/10.1117/12.2687420