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Simultaneous cooling of two levitated macromagnets in cavity magnomechanical system

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Abstract

Cooling the motion of multiple isolated, levitated particles has the potential to explore the limits of quantum mechanics in a new mass regime. This technique not only serves as a foundation for examining macroscopic quantum states and building high-precision sensors, but also crucial for overcoming detrimental cross-coupling and decoherence effects in multimode systems. In this paper, we studied that the center-of-mass modes of multi-magnons can be simultaneously cooled to their quantum ground states. Our scheme is realized by adjusting the coupling position of the particle to compensate for the reduction in coupling strength due to magnonic excitations. Additionally, we find that the cooling rate of a magnon is influenced by its own coupling strength and the effective detuning. The numerical simulation results indicate that the lowest phonon occupancy can be cooled to less than 1 simultaneously.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 12074070 and the Natural Science Foundation of Fujian Province under Grant No.2020J01471.

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  1. Rong-Xiang Luo and Zhi-Rong Zhong contributed equally to this work.

Authors and Affiliations

  1. Department of Physics, Fuzhou University, Fuzhou, 350002, China

    Lei Chen, Liang Bin, Sai-Yun Ye, Rong-Xiang Luo & Zhi-Rong Zhong

  2. Fujian Key Laboratory of Quantum Information and Quantum Optics, Fuzhou University, Fuzhou, 350002, China

    Lei Chen, Liang Bin, Sai-Yun Ye & Rong-Xiang Luo

  3. Department of Physics, Tianjin University, Tianjin, 300350, China

    Yang Liu

  4. Center for the Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300350, China

    Yang Liu

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Contributions

C.L.: Proposed the research question, designed the theoretical framework, completed the derivations, conducted numerical simulations, analyzed the results, and wrote the article. L.Y: Completed the revisions of the paper and assisted in theoretical discussions. B.L.: Revised the draft. Y.S.Y: Revised the draft. L.R.X: Completed the revisions of the paper and ensured the scientific integrity of the research. Z.Z.R: Provided overall guidance, reviewed the content, and ensured the scientific integrity of the research. All authors reviewed the final manuscript and agreed to its submission.

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Chen, L., Liu, Y., Bin, L. et al. Simultaneous cooling of two levitated macromagnets in cavity magnomechanical system. Quantum Inf Process 24, 76 (2025). https://doi.org/10.1007/s11128-025-04690-0

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