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Advanced Quantum Technologies

Nonlinear Enhancement in Hybrid Optomagnonic Systems

Jin Yang, Bingyu Yang, Biao Xiong, Xiaojuan Wang, Jibing Liu

Published Aug 1, 2026• 0 citations
Publisher

Abstract

ABSTRACT Photon blockade is a key quantum effect for generating single‐photon sources essential to quantum information processing. Compared with unconventional photon blockade, the conventional counterpart provides higher single‐photon generation efficiency but typically demands strong nonlinearity, which severely restricts experimental feasibility. Here, a nonlinear enhancement scheme based on a hybrid optomagnonic system is proposed. The central idea is to exploit an additional tripartite interaction among the TE mode, TM mode, and magnon that, under strong driving, induces two‐mode squeezing. Via a squeezing transformation, the effective magnon–photon coupling is exponentially enhanced, giving rise to a strong effective Kerr nonlinearity and thus an increased energy‐level detuning. Using both analytical calculations and numerical simulations of the second‐order correlation function, it is shown that the conventional photon blockade is substantially enhanced. Compared with the pure optomagnonic scheme induced by the Faraday effect, the proposed approach reduces the second‐order correlation function by more than an order of magnitude and dramatically broadens the blockade parameter window. Moreover, photon blockade is achieved even when the intrinsic coupling strength is much smaller than the cavity decay rate. These results suggest a feasible route toward high‐efficiency conventional photon blockade without strong intrinsic nonlinearities, potentially facilitating on‐chip single‐photon sources for scalable quantum information processing.

DOI
10.1002/qute.70391

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ABSTRACT Photon blockade is a key quantum effect for generating single‐photon sources essential to quantum information processing. Compared with unconventional photon blockade, the conventional counterpart provides higher single‐photon generation efficiency but typically demands strong nonlinearity, which severely restricts experimental feasibility. Here, a nonlinear enhancement scheme based on a hybrid optomagnonic system is proposed. The central idea is to exploit an additional tripartite interaction among the TE mode, TM mode, and magnon that, under strong driving, induces two‐mode squeezing. Via a squeezing transformation, the effective magnon–photon coupling is exponentially enhanced, giving rise to a strong effective Kerr nonlinearity and thus an increased energy‐level detuning. Using both analytical calculations and numerical simulations of the second‐order correlation function, it is shown that the conventional photon blockade is substantially enhanced. Compared with the pure optomagnonic scheme induced by the Faraday effect, the proposed approach reduces the second‐order correlation function by more than an order of magnitude and dramatically broadens the blockade parameter window. Moreover, photon blockade is achieved even when the intrinsic coupling strength is much smaller than the cavity decay rate. These results suggest a feasible route toward high‐efficiency conventional photon blockade without strong intrinsic nonlinearities, potentially facilitating on‐chip single‐photon sources for scalable quantum information processing.
We propose a hybrid cavity-magnon system scheme that integrates a yttrium iron garnet sphere with a microwave cavity filled with Kerr medium, aiming to achieve both conventional and unconventional photon blockade simultaneously. Our research demonstrates that by tuning the strength of the Kerr nonlinearity and adjusting the two-photon driving intensity, we can realize quantum effects associated with both types of photon blockade. Furthermore, through careful selection of system parameters, we have obtained optimal results for photon blockade under ideal conditions. This scheme fully exploits the advantages offered by both conventional and unconventional photon blockade mechanisms, effectively reducing the equal-time second-order photon correlation function while also achieving a higher mean photon number. It provides an alternative and experimentally feasible platform for preparing single-photon sources characterized by enhanced purity and brightness.
Abstract A scheme is proposed to realize strong photon blockade (PB) effect in cavity magnomechanical system by incorporating a magnon parametric amplification (MPA). By analyzing the theoretical model of this system, it is found that the introduction of MPA not only increases additional transition pathways but also facilitates destructive interference between different transition paths, leading to a significantly enhanced unconventional photon blockade (UPB). This research demonstrates that PB is highly sensitive to phase and driving strength, and the optimized parameter relationships provide effective guidance for achieving quantum correlation. Furthermore, these conditions are closely related to the strength of the magnon‐photon coupling, indicating the significant impact of the system's nonlinear characteristics on the photon–photon correlations. This work not only deepens the understanding of quantum interference in hybrid cavity systems but also provides a viable route toward realizing high‐purity single‐photon sources in magnomechanical platforms.
Abstract We propose a scheme for generating high-quality single-photon sources utilizing the conventional photon blockade (CPB) effect in a cavity optomagnonic system with Kerr nonlinearity. The realization of the CPB effect depends on both the Kerr nonlinearity and Kerr-like nonlinearity of the optical cavity, which is converted using magneto-optical coupling. The CPB effect can be realized in a cavity optomagnonic system with weak magneto-optical coupling by modulating the strength of the Kerr nonlinearity. Notably, our scheme supports photon blockade in both the strong and weak Kerr nonlinear regimes, which broadens the range of experimental parameters. Furthermore, we explored the parameter regimes where the CPB effect could not be achieved because of the combined effects of the magneto-optical coupling and Kerr nonlinearity. We also determined the optimal driving amplitude region for generating high-quality single-photon sources. This work not only provides a novel route for realizing the CPB effect but also establishes a versatile platform for producing single-photon sources with high purity and brightness.
ABSTRACT We propose a scheme to realize magnon blockade in a hybrid system composed of a transmon‐type superconducting qubit directly coupled to the magnon mode of a single‐crystalline yttrium‐iron‐garnet sphere. By applying two‐tone driving to the qubit, we engineer an effective Hamiltonian for the magnon mode including both single‐magnon and two‐magnon interaction. Due to the destructive interference between two transition paths, the two‐magnon excitation is suppressed, and thus the unconventional magnon blockade can be achieved. We also demonstrate that the intrinsic anharmonicity of the qubit can be transferred to the magnon mode through their coherent hybridization, but this anharmonicity has almost no influence on the blockade effect. Through solving the second‐order correlation function analytically and numerically, we show that the scheme can be realized under experimentally feasible conditions and remains robust against system dissipations and environment temperature. Therefore, the presented work provides a viable path toward generating single‐magnon sources and advancing quantum information processing with magnonic platforms.
Strong and controllable tripartite interactions play a pivotal role in quantum information and nonlinear quantum optics, yet challenging to realize. In this work, we propose a hybrid system consisting of a nitrogen-vacancy (NV) center coupled to Kerr magnons (magnons with Kerr nonlinearity) in two yttrium-iron-garnet spheres. By adiabatically eliminating the ground state of the NV qutrit in the dispersive regime, an effective tripartite interaction among magnons and an NV qubit encoded in its excited states is obtained. In the strong driving limit, Kerr magnons can be linearized and give rise to degenerate parametric amplification for squeezing magnons. As a result, both the tripartite interaction and cooperativity are exponentially enhanced twice, which is about exp⁡(ξ)\exp(ξ)exp(ξ) times than schemes only involving single-squeezing. Hence, our proposal is more experimentally feasible because modest squeezing parameter is sufficient. With this amplified tripartite coupling strength, the system dynamics are greatly accelerated, leading to fast generation of tripartite entanglement. In addition, noise-resilient perfect magnon blockade can be achieved, well predicted by both the analytical approach and numerical simulation with quantum master equation. Our results suggest that the NV center represents a promising interface for engineering many-body interactions in quantum magnonics, offering a versatile platform for exploring fundamental quantum phenomena such as entanglement and correlations.
Magnon blockade is an effective physical mechanism to generate a single magnon, which is of great importance in quantum information processing. We present a scheme to realize the unconventional magnon blockade effect by using Kerr nonlinearity in a cavity electromagnonic system. Under weak driving conditions, we give the optimal parameter conditions for magnon antibunching through analytical calculations, which are in good agreement with numerical results. Furthermore, we find that Kerr nonlinearity is necessary to create magnon blockade. In particular, unconventional magnon blockade can be achieved in both weak nonlinearity and weak coupling regimes. The present scheme indicates a method for generating unconventional magnon blockade effect and provides a feasible and flexible platform for the realization of a single-magnon source with high purity.