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Keywords = cavity magnonics

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10 pages, 1554 KB  
Article
Antiferromagnetic Spin Wave Amplification by Scattering in the Presence of Non-Uniform Dzyaloshinskii–Moriya Interaction
by Taeheon Kim, Geun-Ju Kim, Jung-Il Kim and Kwang-Ho Jang
Materials 2024, 17(22), 5585; https://doi.org/10.3390/ma17225585 - 15 Nov 2024
Viewed by 1185
Abstract
In this study, we suggest a method to amplify spin waves (SWs) in antiferromagnets (AFMs). By introducing a non-uniform Dzyaloshinskii–Moriya (DM) interaction, the potential barrier forms a resonant cavity. SWs with an opposite chirality undergo scattering and are resonantly amplified at a phase-matching [...] Read more.
In this study, we suggest a method to amplify spin waves (SWs) in antiferromagnets (AFMs). By introducing a non-uniform Dzyaloshinskii–Moriya (DM) interaction, the potential barrier forms a resonant cavity. SWs with an opposite chirality undergo scattering and are resonantly amplified at a phase-matching condition. The calculation is performed in the insulating AFMs where the electric-field-induced DM interaction and pseudo-dipole anisotropy broaden the parabolic-like SW band for multiple resonant modes. Using a transfer matrix method, we also show numerically that scattering between SWs contributes significantly to the SW amplification. Since the electric field selectively amplifies the SWs with resonant frequencies, the proposed device works as an SW transistor and rectifier. This finding will contribute to insulating AFM-based magnon devices where Joule heating is, in principle, avoided. Full article
(This article belongs to the Special Issue Magnetic Nanomaterials: Synthesis, Characterization and Applications)
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13 pages, 4584 KB  
Article
Feedback Control of Quantum Correlations in a Cavity Magnomechanical System with Magnon Squeezing
by Mohamed Amazioug, Shailendra Singh, Berihu Teklu and Muhammad Asjad
Entropy 2023, 25(10), 1462; https://doi.org/10.3390/e25101462 - 18 Oct 2023
Cited by 36 | Viewed by 2326
Abstract
We suggest a method to improve quantum correlations in cavity magnomechanics, through the use of a coherent feedback loop and magnon squeezing. The entanglement of three bipartition subsystems: photon-phonon, photon-magnon, and phonon-magnon, is significantly improved by the coherent feedback-control method that has been [...] Read more.
We suggest a method to improve quantum correlations in cavity magnomechanics, through the use of a coherent feedback loop and magnon squeezing. The entanglement of three bipartition subsystems: photon-phonon, photon-magnon, and phonon-magnon, is significantly improved by the coherent feedback-control method that has been proposed. In addition, we investigate Einstein-Podolsky-Rosen steering under thermal effects in each of the subsystems. We also evaluate the scheme’s performance and sensitivity to magnon squeezing. Furthermore, we study the comparison between entanglement and Gaussian quantum discord in both steady and dynamical states. Full article
(This article belongs to the Special Issue Advances in Quantum Communication)
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12 pages, 5683 KB  
Article
Measurement-Based Control of Quantum Entanglement and Steering in a Distant Magnomechanical System
by Huatang Tan
Photonics 2023, 10(10), 1081; https://doi.org/10.3390/photonics10101081 - 26 Sep 2023
Cited by 4 | Viewed by 1645
Abstract
In this paper, we propose a scheme for measurement-based control of hybrid Einstein–Podolsky–Rosen (EPR) entanglement and steering between distant macroscopic mechanical oscillator and yttrium iron garnet (YIG) sphere in a system of an electromechanical cavity unidirectionally coupled to an electromagnonical cavity. We reveal [...] Read more.
In this paper, we propose a scheme for measurement-based control of hybrid Einstein–Podolsky–Rosen (EPR) entanglement and steering between distant macroscopic mechanical oscillator and yttrium iron garnet (YIG) sphere in a system of an electromechanical cavity unidirectionally coupled to an electromagnonical cavity. We reveal that when the output of the electromagnonical cavity is continuously monitored by homodyne detection, not only the phonon–magnon entanglement and steering but also the purities of the phononic, magnonic and phonon–magnon states are considerably enhanced. We also find that the measurement can effectively retrieve the magnon-to-phonon steering, which is not yet obtained in the absence of the measurement. We show that unconditional phonon–magnon entanglement and steering can be achieved by introducing indirect feedback to drive the magnon and mechanical subsystems. The long-distance macroscopic hybrid entanglement and steering can be useful for, e.g., fundamental tests for quantum mechanics and quantum networks. Full article
(This article belongs to the Special Issue Hybrid Quantum Magnonics)
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11 pages, 1763 KB  
Article
Distant Magnon-Magnon Coupling Mediated by Nonresonant Photon
by Qi Zhang, Yitong Sun, Jianshu Xue and Lihui Bai
Symmetry 2023, 15(2), 518; https://doi.org/10.3390/sym15020518 - 15 Feb 2023
Cited by 2 | Viewed by 3094
Abstract
In this paper, we theoretically and experimentally study the distant magnon-magnon coupling mediated by nonresonant photons. We establish a magnon-photon-magnon coupling model for two CrCl3 crystals spacial separated on a microstrip line. By changing the phase difference of the samples from 0 [...] Read more.
In this paper, we theoretically and experimentally study the distant magnon-magnon coupling mediated by nonresonant photons. We establish a magnon-photon-magnon coupling model for two CrCl3 crystals spacial separated on a microstrip line. By changing the phase difference of the samples from 0 to π in order to manipulate the distant magnons from coherent coupling to dissipative coupling, our coupling model predicts that the dispersion is tunable from a level repulsion to a level attraction. In addition, we experimentally demonstrate that two spacial separated CrCl3 crystals over a distance of 1.2 cm couple each other indirectly via the microwave photons on the microstrip line. Our works for the distant magnon-magnon coupling mediated by nonresonant photons might provide new sight into long-distant information transmission. Full article
(This article belongs to the Special Issue New Challenges in Cavity Magnonics and Symmetry)
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11 pages, 18042 KB  
Article
The Classicality and Quantumness of the Driven Qubit–Photon–Magnon System
by Maged Faihan Alotaibi, Eied Mahmoud Khalil, Mahmoud Youssef Abd-Rabbou and Marin Marin
Mathematics 2022, 10(23), 4458; https://doi.org/10.3390/math10234458 - 25 Nov 2022
Cited by 8 | Viewed by 2115
Abstract
The hybrid architecture of the driven qubit–photon–magnon system has recently emerged as a promising candidate for novel quantum technologies. In this paper, we introduce the effective wave-function of a superconducting single qubit and a magnon mode contained within a cavity resonator and an [...] Read more.
The hybrid architecture of the driven qubit–photon–magnon system has recently emerged as a promising candidate for novel quantum technologies. In this paper, we introduce the effective wave-function of a superconducting single qubit and a magnon mode contained within a cavity resonator and an external field. The non-classicality of the magnon and resonator modes are investigated by using the negative values of the Wigner function. Additionally, we discuss the non-classicality of the qubit state via the Wigner–Yanase skew information. We find that the mixture angle of the qubit–resonator plays a controllable role in non-classicality. However, the strength of the magnon–photon increases the non-classical behaviour of the system. Full article
(This article belongs to the Section E: Applied Mathematics)
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10 pages, 1998 KB  
Communication
Kerr-Nonlinearity-Triggered Nonclassicality of Magnons in a Photon-Magnon Coupling System
by Xi Jiang, Shiqing Tang and Songsong Li
Photonics 2022, 9(10), 681; https://doi.org/10.3390/photonics9100681 - 21 Sep 2022
Cited by 4 | Viewed by 2389
Abstract
Hybrid quantum systems have attracted much attention due to the fact that they combine the advantages of different physical subsystems. Cavity QED (cavity quantum electrodynamics) with magnons is a hybrid quantum systems that combines a YIG (Yttrium Iron Garnet) sphere and a 3D [...] Read more.
Hybrid quantum systems have attracted much attention due to the fact that they combine the advantages of different physical subsystems. Cavity QED (cavity quantum electrodynamics) with magnons is a hybrid quantum systems that combines a YIG (Yttrium Iron Garnet) sphere and a 3D (three-dimensional) rectangular microwave cavity. Based on this hybrid photon-magnon system, we obtain an approximate analytic solution by the RWA (rotating wave approximation) with an ingenious transformation. After skillfully diagonalizing the Hamiltonian, we show that the Kerr-nonlinearity interactions could yield a negativity value of the Wigner function, periodic quadrature squeezing effects, antibunching property, and field nonclassicality in the magnon. Our work may stimulate the study of nonclassicality of photon-magnon coupling systems and its potential applications in quantum information processing. Full article
(This article belongs to the Special Issue Quantum Optics: Science and Applications)
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