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Physics Letters A

Enhanced maximum entanglement between two microwave fields in the cavity magnomechanics with an optical parametric amplifier

Abdelkader Hidki, Ya-long Ren, Abderrahim Lakhfif, Jamal El Qars, Mostafa Nassik

Published Jan 30, 2023• 30 citations
Publisher
DOI
10.1016/j.physleta.2023.128667

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We propose a method to enhance bipartite and tripartite entanglement in cavity magnomechanics using an optical parametric amplifier (OPA). We analyze this system and identified parametric regimes where different types of entanglement are enhanced. We show that a proper choice of phase of the parametric amplifier leads to the enhancement of the bipartite entanglements. Moreover, the tripartite entanglement is also significantly enhanced in the presence of the OPA. The OPA not only enhances the strength of entanglement but also increases the domain of entanglement over a wider space of detunings as compared to the system when no OPA is present. Similarly, the robustness of entanglement against temperature is also enhanced. Another important consequence of the OPA is the fact that it relaxes the requirement of strong magnon-phonon coupling to generate cavity-magnon entanglement which is necessary for the case when the OPA is not present. We believe that the presented scheme is a step forward to realize robust quantum entanglement using current technology.
Abstract We study photon–phonon entanglement in a cavity magnomechanical system assisted by an optical parametric amplifier (OPA) and an auxiliary magnon mode. In this hybrid system, the OPA modifies the cavity-field fluctuations through its gain and phase, while the auxiliary magnon mode introduces an additional coherent pathway for strengthening the cavity-phonon quantum correlation. By employing the linearized quantum Langevin equations and the covariance-matrix formalism, we investigate the bipartite entanglement of the system. We find that the auxiliary magnon mode enhances the cavity-phonon entanglement in a suitable parameter regime, and that the OPA can further improve the entanglement through properly chosen gain and phase. In addition, their combined action broadens the parameter region for strong entanglement and improves its robustness against thermal noise. Our scheme provides a promising approach for achieving enhanced and robust entanglement in cavity magnomechanical systems.