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Updated: Sep 17, 2025

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Cavity-magnon polaritons strongly coupled to phonons
Rui-Chang Shen1, Jie Li2, Yi-Ming Sun1
1Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, School of Physics, and State Key Laboratory for Extreme Photonics and Instrumentation, Zhejiang University, Hangzhou, 310027, China.
None:
Building hybrid quantum systems is a crucial step for realizing multifunctional quantum technologies, quantum information processing, and hybrid quantum networks. A functional hybrid quantum system requires strong coupling among its components, however, couplings between distinct physical systems are typically very weak. Here we demonstrate the realization of triple strong coupling in a polaromechanical hybrid system where polaritons, formed by strongly coupled ferromagnetic magnons and microwave photons, are further strongly coupled to phonons. We observe the corresponding polaromechanical normal-mode splitting. By significantly reducing the polariton decay rate via realizing coherent perfect absorption, we achieve a high polaromechanical cooperativity of 9.4 × 103. A quantum cooperativity much greater than unity is achievable at cryogenic temperatures, which would enable various quantum applications. Our results pave the way towards coherent quantum control of photons, magnons and phonons, and are a crucial step for building functional hybrid quantum systems based on magnons.
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