Cavity-less Brillouin strong coupling in a solid-state continuous system

• URL: http://arxiv.org/abs/2507.08673v2
• Date: Thu, 17 Jul 2025 19:42:51 GMT
• Title: Cavity-less Brillouin strong coupling in a solid-state continuous system
• Authors: Laura Blázquez Martínez, Changlong Zhu, Birgit Stiller,
• Abstract summary: 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.<n>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.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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