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Optics & Laser Technology

Entanglement between photonic and magnonic modes in an open optomagnonical system

Mahboobeh Moslehi, Hamid Reza Baghshahi, Mohammad Javad Faghihi, Sayyed Yahya Mirafzali

Published Aug 16, 2023• 10 citations
Publisher
DOI
10.1016/j.optlastec.2023.109920

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Distributing entanglement among distant quantum nodes is essential for building scalable quantum networks. In this paper we propose a scheme to generate multipartite magnonic entanglement in a cavity optomagnonic network via measurement-based feedback. We consider NNN spatially separated cavity optomagnonic systems and the cavity outputs are coupled through a beam-splitter array. The fields from the array's output ports are subjected to continuous homodyne detection, and the measurement outcomes are fed back to the systems. We analytically demonstrate that multipartite magnonic entanglement can be deterministically generated in the present scheme by tuning the local phases of homodyne detection appropriately. The multipartite entanglement arises from photon-magnon entanglement, which is distributed among the magnonic modes via the beam-splitter-array interferometric measurement. We further reveal that the multipartite entanglement is optimized when the cavity field couples to the magnonic mode via a two-mode squeezing interaction in each cavity optomagnonic system, because such an interaction induces optimal magnonic squeezing when homodyning the cavity output. The present scheme can be directly extended to other light-matter systems for realizing multipartite entanglement of continuous variables. Beyond advancing fundamental quantum research, this work provides a practical platform for magnon-based quantum technologies.
We propose a feasible experimental model to investigate the generation and characterization of nonclassical states in a cavity optomagnonic system consisting of a ferromagnetic YIG sphere that simultaneously supports both the magnon mode and two whispering gallery modes of optical photons. The photons undergo the magnon-induced Brillouin light scattering, which is a well-established tool for the cavity-assisted manipulations of magnons as well as magnon spintronics. At first, we derive the desired interaction Hamiltonian under the influence of the anti-Stokes scattering process and then proceed to analyze the dynamical evolution of quantum statistics of photons and magnons as well as their intermodal entanglement. The results show that both photons and magnons generally acquire some nonclassical features, e.g., the strong antibunching and anti-correlation. Interestingly, the system may experience the perfect photon and magnon blockade phenomena, simultaneously. Besides, the nonclassical features may be protected against the unwanted environmental effects for a relatively long time, especially, in the weak driving field regime and when the system is initiated with a small number of particles. However, it should be noted that some fast quantum-classical transitions may occur in-between. Although the unwanted dissipative effects plague the nonclassical features, we show that this system can be adopted to prepare optomagnonic entangled states. The generation of entangled states depends on the initial state of the system and the interaction regime. The intermodal photon-magnon entanglement may be generated and pronounced, especially, if the system is initialized with low intensity even Schrödinger cat state in the strong coupling regime. The cavity-assisted manipulation of magnons is a unique and flexible mechanism that allows an interesting test bed for investigating the interdisciplinary contexts involving quantum optics and spintronics. Moreover, such a hybrid optomagnonic system may be used to design both on-demand single-photon and single-magnon sources and may find potential applications in quantum information processing.