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Scientific Reports

Generation of nonclassical optomagnonic states under the influences of Stokes scattering process and thermal noise

Ebrahim Ghasemian, Mohammad Kazem Tavassoly

Published Jul 29, 2025• 4 citations
Publisher

Abstract

We present a theoretical model for a hybrid optomagnonic system, i.e., a ferromagnetic YIG sphere that supports two optical modes and a magnon mode. The system is considered under the influences of dissipation process, thermal noise, and the Stokes scattering process. In particular, the quantum statistics of particles is evaluated via the dynamical evolution of their respective second-order correlation functions. Generally, the system can provide strong nonclassical features such that both strong antibunching and blockade effects can be realized in the patterns of the photon and magnon quantum statistics. Since the particles lose their nonclassical features in the presence of environmental effects, therefore a quantum-classical crossover takes place, i.e., the antibunched photons are transformed into the bunched particles. Such a crossover may be expected in the patterns of magnon statistics, too. Applying a weak driving field accompanied with a small value of the reorganization parameter facilitates the magnon blockade effect and strong magnon antibunching. Our analyses show that thermal noise degrades the nonclassical features stemming from the individual system components (auto-correlation). In contrast, thermal noise may provide a larger window for realizing the nonclassical properties originated from the joint system components (cross-correlation). Interestingly, when the system includes a small number of particles both correlation and anti-correlation features may be enhanced even in the presence of thermal noise. The nonclassical optomagnonic states can be utilized in various applications, including quantum information processing, sensing, and the study of fundamental quantum mechanics.

DOI
10.1038/s41598-025-13084-2

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Applied Physics Letters•Jun 15, 2026•0 citations
We present a theoretical model for a hybrid optomagnonic system, i.e., a ferromagnetic YIG sphere that supports two optical modes and a magnon mode. The system is considered under the influences of dissipation process, thermal noise, and the Stokes scattering process. In particular, the quantum statistics of particles is evaluated via the dynamical evolution of their respective second-order correlation functions. Generally, the system can provide strong nonclassical features such that both strong antibunching and blockade effects can be realized in the patterns of the photon and magnon quantum statistics. Since the particles lose their nonclassical features in the presence of environmental effects, therefore a quantum-classical crossover takes place, i.e., the antibunched photons are transformed into the bunched particles. Such a crossover may be expected in the patterns of magnon statistics, too. Applying a weak driving field accompanied with a small value of the reorganization parameter facilitates the magnon blockade effect and strong magnon antibunching. Our analyses show that thermal noise degrades the nonclassical features stemming from the individual system components (auto-correlation). In contrast, thermal noise may provide a larger window for realizing the nonclassical properties originated from the joint system components (cross-correlation). Interestingly, when the system includes a small number of particles both correlation and anti-correlation features may be enhanced even in the presence of thermal noise. The nonclassical optomagnonic states can be utilized in various applications, including quantum information processing, sensing, and the study of fundamental quantum mechanics.
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.
Abstract The phenomena of photon and magnon blockade, and nonclassicality which are the key ingredient for quantum enhanced technologies, can be considered as resources in quantum information processing. This paper deals with the study of nonclassicality in a lossy optomagnonic microcavity enclosed by Kerr medium, with considering different sources of dissipation. The system contains a ferromagnetic YIG sphere coupled to two optical modes in a microcavity, with photonic and magnonic Kerr nonlinearity in the presence of magnonic and photonic losses. Considering the Heisenberg-Langevin approach, we obtain the dynamics of the second-order correlation functions (CFs) to observe the phenomenon of photon and magnon blockade (PMB), and the Cauchy-Schwarz inequality (CSI) to find the nonclassicality of the system. We then discuss the effects of magnon-photon coupling strength and different sources of dissipation on the temporal behavior of the mentioned criteria. Looking at the numerical results, we find that the depth and the domain of antibunching behavior significantly depend on the value of the thermal average photon (magnon) number. The phenomenon of perfect PMB may also be observed in the presence of dissipation at the low-temperature regime where the equilibrium thermal photon (magnon) occupation number approaches zero, i.e. T → 0. Moreover, we see a strong anticorrelation between the photonic and magnonic modes and the optical modes, too. Furthermore, it can be found that the phenomenon of PMB blockade as well as antibunching can be observed at cryogenic temperatures.
Nonclassical states of quantized light are essential resources for quantum information science and emerging quantum technologies. In this work, we investigate the generation of such states in a dissipative hybrid system, namely a microcavity consisting of a ferromagnetic yttrium iron garnet (YIG) sphere coupled to a quantized microwave cavity mode, and particularly incorporating several nonlinear quantum optical elements including various Kerr media, optical parametric amplifier (OPA), and a magnonic parametric amplifier (MPA) which is introduced as the magnonic analog of the OPA. Decoherence effects arise from thermal photonic and magnonic reservoirs. Using the Heisenberg–Langevin formalism, we analyze the influence of Kerr nonlinearities, OPA, and MPA on several nonclassical signatures, including antibunching, entanglement, quadrature squeezing, and violation of the Cauchy–Schwarz inequality. Numerical results show that photon and magnon antibunching, as well as violation of the Cauchy–Schwarz inequality, can persist even in the presence of considerable dissipation, although these effects weaken as the thermal photon and magnon populations increase. In contrast, entanglement and quadrature squeezing remain remarkably robust against thermal noise. Furthermore, we demonstrate that the inclusion of OPA and MPA generally enhances all investigated nonclassical effects, whereas Kerr nonlinearities have negligible influence within the considered parameter regimes.
Abstract Hybridized magnonic–photonic systems promise novel applications for future information processing technologies. Here, a hybrid magnonic system comprising of a qutrit (Λ‐type three‐level atom) and a ferromagnetic YIG sphere is considered. Indeed, the whole system is driven by two light fields under the influence of the thermal environment. The indirect magnon–atom interaction is established via the virtual photon exchange. The associated Lindblad master equation is derived and its solution is found to investigate the nonclassical feature, especially in the steady‐state solution. Generally, the system shows considerable nonclassicality, that is, strong magnon antibunching and magnon blockade. In fact, the feasibility of using such a hybrid system to prepare a single‐magnon source based on magnon blockade effects we theoretically demonstrated. Besides, the considered system may be exploited to generate robust and stable magnon–atom entanglement. The appearance of magnon blockade and magnon–atom entanglement in the Λ‐type atom may have its origin in the fact that the atom is trapped in different superposition states, induced by the quantum interference phenomenon. The proposed model and the corresponding results may open up an intriguing prospect to prepare a single‐magnon source and provide further benefits through concatenating with photons in optomagnonic systems.
Recent studies show that hybrid quantum systems based on magnonics provide a new and promising platform for generating macroscopic quantum states involving a large number of spins. Here, we show how to entangle two magnon modes in two massive yttrium-iron-garnet (YIG) spheres using cavity optomagnonics, where magnons couple to high-quality optical whispering gallery modes supported by the YIG sphere. The spheres can be as large as 1 mm in diameter and each sphere contains more than 1018{10}^{18}1018 spins. The proposal is based on the asymmetry of the Stokes and anti-Stokes sidebands generated by the magnon-induced Brillouin light scattering in cavity optomagnonics. This allows one to utilize the Stokes and anti-Stokes scattering process, respectively, for generating and verifying the entanglement. Our work indicates that cavity optomagnonics could be a promising system for preparing macroscopic quantum states.
We investigate magnon–photon pair antibunching in a cavity optomagnonic system, in which a yttrium iron garnet sphere simultaneously supports two optical modes and a magnon mode and is driven by squeezed light and coherent light. The results illustrate that by applying squeezed light, the conventional magnon–photon pair blockade (CMPPB) originating from anharmonic energy levels and the unconventional magnon–photon pair blockade (UMPPB) induced by destructive quantum interference can coexist in the same platform. Both blockade effects can be flexibly tuned by the driving detuning and the optomagnonic coupling strength. Within the explored parameter regime, the UMPPB exhibits a nontrivial dependence on the driving strengths of coherent light and squeezed light, and bunching regions may also appear. These results provide a tunable framework for controlling magnon–photon pair antibunching, which may be useful for the generation and manipulation of hybrid nonclassical states in cavity optomagnonic systems.