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Enhanced entanglement and steering in PT -symmetric cavity magnomechanics

We study creation of entanglement and quantum steering in a parity-time- (PT-) symmetric cavity magnomechanical system. There are photon–magnon coupling and phonon–magnon coupling in this system. By introducing a gain cavity mode, a PT-symmetric Hamiltonian of the system is obtained. We find that bi...

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Bibliographic Details
Published in:Optics communications 2021-07, Vol.490, p.126903, Article 126903
Main Authors: Ding, Ming-Song, Xin, Xuan-Xuan, Qin, Si-Yu, Li, Chong
Format: Article
Language:English
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Summary:We study creation of entanglement and quantum steering in a parity-time- (PT-) symmetric cavity magnomechanical system. There are photon–magnon coupling and phonon–magnon coupling in this system. By introducing a gain cavity mode, a PT-symmetric Hamiltonian of the system is obtained. We find that bipartite entanglement and magnon→phonon steering in PT-symmetry system (gain–loss system) are significantly enhanced versus the case in the conventional cavity magnomechanical system (loss–loss system). Moreover, the magnon→phonon one-way-like quantum steering can be realized in unbroken-PT-symmetry regime. The boundary of stability is demonstrated and it shows that the gain–loss system becomes more stable with respect to the conventional loss–loss system under the parameters we consider. This work opens up a route to explore the characteristics of quantum entanglement and steering in magnomechanical systems, which might have potential applications in quantum state engineering and quantum information. •Compared with the conventional cavity magnomechanical systems in the work Li (Phys. Rev. Lett. 121, 203601 2018), the bipartite entanglement can be enhanced, especially for magnon–phonon entanglement and photon–phonon entanglement.•Compared with the work Tan (Phys. Rev. Research 1, 033161 2019), we further found that the quantum steering is enhanced by PT-symmetry.•The magnon→phonon one-way-like quantum steering can be realized in unbroken-PT-symmetry regime.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2021.126903