https://doi.org/10.1140/epjqt/s40507-025-00458-8
Research
Enhancement of optomagnonic coupling and microwave-optical conversion via magnetic anisotropy
1
Department of Mathematics and Physics, Fujian Jiangxia University, 350108, Fuzhou, China
2
Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, College of Physics and Energy, Fujian Normal University, 350117, Fuzhou, China
3
Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, 350117, Fuzhou, China
4
Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, 350117, Fuzhou, China
a
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b
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Received:
9
November
2025
Accepted:
18
December
2025
Published online:
30
December
2025
Efficient microwave-optical frequency conversion is critical for building long-distance quantum networks. Magnons in ferromagnets offer a promising mediator for this conversion, owing to their ability to couple to both microwave and optical fields. However, the magnon-mediated microwave-optical conversion efficiency is severely limited by the inherently weak optomagnonic coupling. Here, we propose a scheme to enhance the optomagnonic coupling by utilizing the intrinsic magnetic anisotropy in a yttrium iron garnet (YIG) thin film. The presence of magnetic anisotropy establishes a squeezed vacuum for the magnonic ground state, which enhances the effective optomagnonic coupling strength by a factor of 
, where r is the squeezing parameter. This results in a significant boost of the corresponding cooperativities and, consequently, the microwave-to-optical conversion efficiency by several orders of magnitude for large squeezing. Our approach harnesses magnon squeezing as an intrinsic resource to strengthen optomagnonic interactions, creating opportunities for high-efficiency microwave-optical conversion.
Key words: Microwave-optical frequency conversion / Squeezed magnons / Enhancement
© The Author(s) 2025
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