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Nonreciprocal entanglement and asymmetric steering via magnon Kerr effect in cavity optomagnonic system

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Abstract

We present a scheme to generate nonreciprocal entanglement and asymmetric steering between an atomic ensemble and a magnon based on Kerr nonlinearity of magnon in an yttrium iron garnet sphere. In particular, a cavity optomagnonic system is under our consideration, where the optical cavity couples with an ensemble of N two-level atoms, and meanwhile nonlinearly interacts with the magnon mode via optomagnonic coupling. The results demonstrate that the steady-state macroscopic quantum correlations including magnon-atomic ensemble entanglement and Einstein–Podolsky–Rosen steering could be obtained via strongly driving the cavity mode. More importantly, tuning the direction of the static magnetic field leads to a positive or negative magnon Kerr coefficient, which leads to a corresponding shift in magnon frequency and thus induces the nonreciprocity of entanglement. Furthermore, the one-way steering between magnon and atomic ensemble is also shown via properly choosing the coupling strengths and effective Kerr parameters. Our work could have potential applications in the preparation of macroscopic quantum states and be applied to construct long-distance quantum networks.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grants Nos. 12465002, 12465003 and 12175199), the Natural Science Foundation of Jiangxi Province (Grant No. 20232ACB201013), and the Foundation of Department of Science and Technology of Zhejiang Province (Grant No. 2022R52047).

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Authors and Affiliations

  1. Department of Applied Physics, East China Jiaotong University, Nanchang, 330013, China

    Shuqi Hu, Jiajun Liu, Guangling Cheng & Jiansong Zhang

  2. Department of Physics, Zhejiang Sci-Tech University, Hangzhou, 310018, China

    Aixi Chen

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  1. Shuqi Hu
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Hu, S., Liu, J., Cheng, G. et al. Nonreciprocal entanglement and asymmetric steering via magnon Kerr effect in cavity optomagnonic system. Quantum Inf Process 24, 39 (2025). https://doi.org/10.1007/s11128-025-04658-0

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