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Robust mechanical entanglement in an atom-assisted hybrid optomechanical system

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Abstract

We theoretically explore the bipartite robust steady-state entanglement between two charged nanomechanical oscillators in an atom-assisted hybrid optomechanical system. The logarithmic negativity is adopted to measure entanglement. We find that the mechanical entanglement induced by Coulomb interaction could only survive at ultralow temperature of a few tens of mK in case of bare cavity. However, by adding the atomic degrees of freedom, the entanglement properties could be effectively modified including a further enhanced degree and broadened range of entanglement. In addition, the enhanced entanglement becomes more robust against thermal noise. This robustness is more evident when appropriately increasing the laser power. Compared to the case of no atoms, the critical temperature is raised by about two orders of magnitude.

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All data included in this study are available upon request by contact with the corresponding author.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 11775190 and 12175199, and Zhejiang Provincial Natural Science Foundation of China under Grant No. LZ20A040002.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, 310018, China

    Yuan Chen & Ai-Xi Chen

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

    Ai-Xi Chen

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

    Yuan Chen

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Chen, Y., Chen, AX. Robust mechanical entanglement in an atom-assisted hybrid optomechanical system. Quantum Inf Process 21, 370 (2022). https://doi.org/10.1007/s11128-022-03686-4

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