Overcoming intrinsic material limitations through cavity feedback

• URL: http://arxiv.org/abs/2603.13515v1
• Date: Fri, 13 Mar 2026 18:48:30 GMT
• Title: Overcoming intrinsic material limitations through cavity feedback
• Abstract summary: We implement an active microwave feedback loop to suppress the linewidth of cavity-magnon polaritons.<n>As a key milestone, we achieve normal-mode splitting between a cavity-magnon polariton and a mechanical mode.<n>Our results establish feedback as a general route to accessing strong-coupling regimes in systems previously thought to be limited by material properties.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Magnons, the quanta of spin waves, have significant potential for use in modern technologies, especially when strongly coupled to another mode for read-out and control. However, while magnons strongly interact with microwave photons via the magnetic-dipole interaction to form hybrid cavity-magnon polariton modes, the weak magnetostrictive magnon-phonon interaction, together with large polariton linewidths dominated by magnon dissipation, has so far restricted magnonic-spheres to the weak-coupling regime. The material-limited magnon dissipation rate in particular has been regarded as an unavoidable limitation in these systems. Here, we surpass this long-standing limitation by implementing an active microwave feedback loop to suppress the linewidth of cavity-magnon polaritons and strongly suppress their effective decay rate below the magnon-limited linewidth, thereby enhancing the polariton-phonon cooperativity from C=1 to C=150. As a key milestone, we achieve normal-mode splitting between a cavity-magnon polariton and a mechanical mode, providing direct evidence of three-mode hybridization among photons, magnons, and phonons. Our results establish feedback as a general route to accessing strong-coupling regimes in systems previously thought to be limited by material properties and hence open new opportunities for coherent control in hybrid quantum systems.

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