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Enhanced entanglement and asymmetric EPR steering between magnons

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Abstract

The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen (EPR) steering in macroscopic systems are outstanding challenges in modern physics. Especially, the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly asymmetric. Here, we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light system. In the absence of light, the two types of magnons on the two sublattices can be entangled, but no quantum steering occurs when they are damped with the same rates. In the presence of the cavity field, the entanglement can be significantly enhanced, and strong two-way asymmetric quantum steering appears between two magnons with equal dissipation. This is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing steerability. The essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity photons. Our finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet.

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Author information

Authors and Affiliations

  1. State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics, School of Physics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, 100871, China

    Sha-Sha Zheng, Feng-Xiao Sun, Qi-Huang Gong & Qiong-Yi He

  2. Beijing Academy of Quantum Information Sciences, Beijing, 100193, China

    Sha-Sha Zheng, Feng-Xiao Sun, Qi-Huang Gong & Qiong-Yi He

  3. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China

    Sha-Sha Zheng, Feng-Xiao Sun, Qi-Huang Gong & Qiong-Yi He

  4. Institute for Theoretical Physics, Utrecht University, 3584CC, Utrecht, The Netherlands

    Huai-Yang Yuan

  5. Quantum Optics and Engineering Division, Institute of Physics, University of Zielona Góra, Zielona Góra, 65-516, Poland

    Zbigniew Ficek

Authors
  1. Sha-Sha Zheng
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  2. Feng-Xiao Sun
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  4. Zbigniew Ficek
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  6. Qiong-Yi He
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Corresponding author

Correspondence to Qiong-Yi He.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11975026, 61475007, and 61704071), the National Key Research and Development Program of China (Grant Nos. 2018YFB1107200, and 2016YFA0301302), the Key Research and Development Program of Guangzhou Province (Grant No. 2018B030329001), and the Beijing Natural Science Foundation (Grant No. Z190005).

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The supporting information is available online at phys.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Zheng, SS., Sun, FX., Yuan, HY. et al. Enhanced entanglement and asymmetric EPR steering between magnons. Sci. China Phys. Mech. Astron. 64, 210311 (2021). https://doi.org/10.1007/s11433-020-1587-5

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