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<p>A theoretical scheme to enhance the bipartite entanglement in a cavity-magnomechanical system by adding a nitrogen-vacancy (NV) center ensemble is proposed. The system comprises a superconducting coplanar waveguide cavity equipped with a magnetometer, as well as cavity microwave photons and phonons. We investigate the effect of the NV center ensemble on bipartite entanglement. The results show that the bipartite entanglement can be significantly improved by modulating the magnon-NV ensemble coupling strength. In addition, the steady-state entangled state of the cavity-magnomechanical system is easily obtained in a wide range of parameters. The energy transfer of magnon-NV center ensemble-phonon can be realized by selecting reasonable system parameters. Similarly, the robustness of the entanglement to temperature is also improved. This scheme provides a promising platform for the study of macroscopic quantum phenomena.</p>

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Enhancement entanglement of cavity-magnomechanical system by nitrogen vacancy center ensemble in diamond

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Qinghong Liao,
  • Ping Cao,
  • Ruochuang Liu,
  • Jinle Xiong,
  • Shaocong Deng

摘要

A theoretical scheme to enhance the bipartite entanglement in a cavity-magnomechanical system by adding a nitrogen-vacancy (NV) center ensemble is proposed. The system comprises a superconducting coplanar waveguide cavity equipped with a magnetometer, as well as cavity microwave photons and phonons. We investigate the effect of the NV center ensemble on bipartite entanglement. The results show that the bipartite entanglement can be significantly improved by modulating the magnon-NV ensemble coupling strength. In addition, the steady-state entangled state of the cavity-magnomechanical system is easily obtained in a wide range of parameters. The energy transfer of magnon-NV center ensemble-phonon can be realized by selecting reasonable system parameters. Similarly, the robustness of the entanglement to temperature is also improved. This scheme provides a promising platform for the study of macroscopic quantum phenomena.