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Squeezed quantum hybrid system:Giant enhancement of magnon-phonon-spin interactions

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 233-234页

作者： Franco Nori Theoretical Quantum Physics Laboratory Cluster for Pioneering ResearchRIKENWakoshiSaitama351-0198Japan Quantum Computing Center RIKENWakoshiSaitama351-0198Japan Physics Department The University of MichiganAnn ArborMichigan48109-1040USA

Quantum magnonics has recently attracted considerable interest not only in fundamental physics but also in applications,ranging from quantum information processing to quantum metrology[1].A unique merit of magnons,the quasiparticles or quantized unit of magnetic excitations in solids,is their ability to be effectively coupled with almost all different quantum information carriers,such as optical photons,mechanical phonons,superconducting qubits,and solid-state spins,which are otherwise difficult to be efficiently integrated together.

关键词： quantum magnon otherwise

Quantum entanglement generation on magnons assisted with microwave cavities coupled to a superconducting qubit

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Frontiers of physics 2023年第4期18卷 311-320页

作者： Jiu-Ming Li Shao-Ming Fei School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

We present protocols to generate quantum entanglement on nonlocal magnons in hybrid systems composed of yttrium iron garnet(YIG)spheres,microwave cavities and a superconducting(SC)qubit.In the schemes,the YIGs are coupled to respective microwave cavities in resonant way,and the SC qubit is placed at the center of the cavities,which interacts with the cavities simultaneously.By exchanging the virtual photon,the cavities can indirectly interact in the far-detuning regime.Detailed protocols are presented to establish entanglement for two,three and arbitrary N magnons with reasonable fidelities.

关键词： magnon superconducting qubit quantum electrodynamics quantum entanglement indirect interaction

Lattice and spin dynamics in multiferroic BiFeO3 and RMnO3

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National Science Review 2019年第4期6卷 642-652页

作者： Yan Song Ben Xu Ce-Wen Nan School of Materials Science and Engineering and State Key Laboratory of New Ceramics and Fine ProcessingTsinghua University

The multiferroic materials Bi Fe O3 and RMn O3 exhibit coexisting magnetic order and ferroelectricity, and provide exciting platforms for new physics and potentially novel devices, where intriguing interplay between phonons and magnons exists. In this review, we paint a complete picture of bulk BiFeOtogether with orthorhombic and hexagonal RMnO(R includes rare-earth elements and yttrium) by summarizing the dynamics of spin and lattice and their magnetoelectric coupling, as well as the methods of controlling these characteristics under non-equilibrium conditions, from experimental and simulation perspectives.

关键词： multiferroics phonon magnon

Observation of nonlinearity and heating-induced frequency shifts in cavity magnonics

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Chinese Physics B 2022年第12期31卷 517-524页

作者：吴维江徐达钱洁李杰王逸璞游建强 Interdisciplinary Center of Quantum Information and Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics and State Key Laboratory of Modern Optical InstrumentationZhejiang UniversityHangzhou 310027China

When there is a certain amount of field inhomogeneity,the biased ferrimagnetic crystal can exhibit the higher-order magnetostatic(HMS)mode in addition to the uniform-precession Kittel mode.In cavity magnonics,we show the nonlinearity and heating-induced frequency shifts of the Kittel mode and HMS mode in a yttrium-iron-garnet(YIG)sphere.When the Kittel mode is driven to generate a certain number of excitations,the temperature of the whole YIG sample rises and the HMS mode can display an induced frequency shift,and vice versa.This cross effect provides a new method to study the magnetization dynamics and paves a way for novel cavity magnonic devices by including the heating effect as an operational degree of freedom.

关键词： magnon magnetostatic mode temperature yttrium-iron-garnet(YIG)

Eigenstates and temporal dynamics in cavity optomagnonics

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Chinese Physics B 2023年第10期32卷 660-665页

作者：丁云静肖杨 School of Physics Nanjing UniversityNanjing 210093China Department of Physics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Many studies of magnon–photon coupling are performed in the frequency domain for microwave photons.In this work,we present analytical results of eigenfrequency,eigenstates,and temporal dynamics for the coupling between ferromagnetic magnon and visible photon.In contrast to microwave photons,optical photons can be coupled with magnon in a dispersive interaction which produces both level repulsion and attraction by varying the magnon–photon frequency detuning.At resonance,the hybridized states are of linear polarization and circular polarization for level repulsion and level attraction respectively.As the detuning increases,the polarizations of level repulsion remain linear but those of level attraction vary from elliptical to linear polarizations.The temporal dynamics of level repulsion presents the beat-like behavior.The level attraction presents monotonous decay in the weak coupling regime but gives rise to instability in the strong coupling regime due to the magnon amplification.As the detuning is large,both magnon and photon amplitudes present a synchronizing oscillation.Our results are important for exploring the temporal evolution of magnon–photon coupling in the range of optical frequency and designing magnon-based timing devices.

关键词： magnon spin wave cavity

Enhanced entanglement and asymmetric EPR steering between magnons

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 55-63页

作者： Sha-Sha Zheng Feng-Xiao Sun Huai-Yang Yuan Zbigniew Ficek Qi-Huang Gong Qiong-Yi He State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-Optoelectronics School of Physics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing100871China Beijing Academy of Quantum Information Sciences Beijing100193China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China Institute for Theoretical Physics Utrecht University3584CCUtrechtThe Netherlands Quantum Optics and Engineering Division Institute of PhysicsUniversity of Zielona GóraZielona Góra65-516Poland

The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen(EPR)steering in macroscopic systems are outstanding challenges in modern physics.Especially,the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly asymmetric.Here,we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light system.In the absence of light,the two types of magnons on the two sublattices can be entangled,but no quantum steering occurs when they are damped with the same rates.In the presence of the cavity field,the entanglement can be significantly enhanced,and strong two-way asymmetric quantum steering appears between two magnons with equal dissipation.This is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing steerability.The essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity photons.Our finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet.

关键词： quantum information magnon entanglement Einstein-Podolsky-Rosen steering cavity induced cooling

Nonlinear interaction of resonator photons with parametric magnon pairs

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Chinese Physics B 2003年第4期12卷 394-398页

作者： ShiQing-Fan YanXue-Qun LiuXue-Guan DepartmentofPhysics SchoolofScienceBeijingInstituteofTechnologyBeijing100081China

We consider the process of parametric resonance of magnons in magneto-ordered crystals in a microwave resonator.The nonlinear interaction of the resonator photons with the parametric magnon pairs is analysed theoretically, and the result expressed by the deviation frequencies relative to the pump frequency further demonstrates that the dynamics of resonator modes plays an important role once the pump power exceeds the threshold of parallel pumping.

关键词： nonlinear interaction magnon parametric resonance

Ferromagnetic Heisenberg spin chain in a resonator

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Chinese Physics B 2021年第9期30卷 178-183页

作者：曹雨松曹俊鹏范桁 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Peng Huanwu Center for Fundamental Theory Xi'an 710127China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We investigate the properties of a generalized Rabi model by replacing the two-level atom in Rabi model with a ferromagnetic Heisenberg spin chain.We find that the dynamical behavior of the system can be divided into four categories.The energy spectrum of the ground state and some low excited states are obtained.When the magnons and the photon are in resonance,the model is exactly solvable and the rigorous solution is obtained.Near the resonance point where the detuning is small,the system is studied with the help of perturbation theory.This model has a spontaneously breaking of parity symmetry,suggesting the existence of a quantum phase transition.The critical exponent from the normal phase is computed.

关键词： magnon resonator quantum phase transition

Photon-magnon interaction process： a mechanism of resonance linewidths of ferromagnet

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Chinese Physics B 2005年第1期14卷 110-114页

作者：李粮生史庆藩 DepartmentofPhysics BeijingInstituteofTechnologyBeijing100081China

We consider the relaxation processes of parametric excitation of magnons in a microwave resonator. Using the approach of unitary transformation, we calculate the effective amplitude of three-boson terms of Hamiltonian, especially for photon-magnon interaction which is expected to contribute to the resonance linewidth of ferromagnets.

关键词： magnon unitary transformation linewidth