Cavity-less Brillouin strong coupling in a solid-state continuous system
Abstract
Strongly coupling two systems allows them to exchange coherent information before the systems decohere. This important regime in light-matter interactions has predominantly been reached in optical resonator configurations. In this work, we present the experimental realization of strong coupling between optical and acoustic fields within a continuum of modes in a cavity-less configuration after a single-pass through an optical waveguide. The underlying physical effect of anti-Stokes Brillouin-Mandelstam scattering in a highly nonlinear fiber at T = 4 K allows us to experimentally demonstrate strong coupling in a waveguide scenario. We show the splitting of the optoacoustic spectral response and introduce a novel technique to measure the avoided crossing of hybrid optoacoustic modes via forced detuning. This demonstration opens a path towards in-line acoustic-waves-based quantum signal processing in waveguide systems.
Cite
@article{arxiv.2507.08673,
title = {Cavity-less Brillouin strong coupling in a solid-state continuous system},
author = {Laura Blázquez Martínez and Changlong Zhu and Birgit Stiller},
journal= {arXiv preprint arXiv:2507.08673},
year = {2025}
}
Comments
Updated version: reference list updated, Fig. 1 increased in size for readability; 6 pages, 4 figures