Magnon heralding in cavity optomagnonics

Bittencourt, Victor A. S. V.; Feulner, Verena; Kusminskiy, Silvia Viola

doi:10.1103/physreva.100.013810

Cited by 63 publications

(34 citation statements)

References 57 publications

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“…For a laser-driven cavity, 𝑔 opt can be enhanced as 𝑔 O opt = P𝑛 5 𝑔 opt , where 𝑛 5 is the steady state number of photons trapped in the cavity. Under driving, 𝐻 opt can be turned into a beam-splitter or a parametric amplifier Hamiltonian by choosing the laser detuning [476]. This corresponds to a linearization procedure, 𝑎 + 𝑎 → P𝑛 5 (𝑎 + + 𝑎), that conceals the intrinsic nonlinear character of 𝐻 opt .…”

Section: E Cavity Magnonicsmentioning

confidence: 99%

“…The strong coupling regime can enable applications at the quantum level, such as the generation and manipulation of nonclassical states of magnons. A protocol to optically write and read single magnon Fock states was proposed in [476] by using 𝐻 opt together with a combination of driving and single photon detection (heralding). In turn, a heralding protocol in the MW regime was put forward for generating magnetic cat states, where the magnetization is in a superposition of two semiclassical states pointing in different directions [477].…”

Section: E Cavity Magnonicsmentioning

confidence: 99%

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Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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Section: E Cavity Magnonicsmentioning

confidence: 99%

Section: E Cavity Magnonicsmentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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“…1). Optomagnonic cavities have been investigated so far exclusively within the scope of ferromagnetic (FM) magnons with GHz frequencies, both experimentally [1][2][3][37][38][39] [although the material of choice, yttrium iron garnet (YIG), is a ferrimagnet, one sublattice has a much larger spin and is dominant] and theoretically [40][41][42][43][44][45][46][47]. We show that for an AFM, different phenomenology emerges.…”

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Antiferromagnetic cavity optomagnonics

Parvini

Bittencourt

Kusminskiy

2020

Phys. Rev. Research

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Currently there is a growing interest in studying the coherent interaction between magnetic systems and electromagnetic radiation in a cavity, prompted partly by possible applications in hybrid quantum systems. We propose a multimode cavity optomagnonic system based on antiferromagnetic insulators, where optical photons couple coherently to the two homogeneous magnon modes of the antiferromagnet. These have frequencies typically in the THz range, a regime so far mostly unexplored in the realm of coherent interactions, and which makes antiferromagnets attractive for quantum transduction from THz to optical frequencies. We derive the theoretical model for the coupled system, and show that it presents unique characteristics. In particular, if the antiferromagnet presents hard-axis magnetic anisotropy, the optomagnonic coupling can be tuned by a magnetic field applied along the easy axis. This allows us to bring a selected magnon mode into and out of a dark mode, providing an alternative for a quantum memory protocol. The dynamical features of the driven system present unusual behavior due to optically induced magnon-magnon interactions, including regions of magnon heating for a red-detuned driving laser. The multimode character of the system is evident in a substructure of the optomagnonically induced transparency window.

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“…by an optical cavity, specific magnons modes can be excited [16]. The interaction can be large enough [17,18] to cool [19] or herald (generating single magnon states) [20] them, making BLS a promising probe into their quantum nature. Present experiment focus on the long wavelength 'Walker' (including the 'Kittel') magnons in optical resonators [21][22][23][24][25].…”

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confidence: 99%

“…(7) is the thermal equilibrium state [33] with no photons since k B T ω b . The input field operatorÂ b of the propagating photons in the coupler [19,20,32] satis-…”

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Coherent pumping of high-momentum magnons by light

et al. 2020

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We propose to excite a large number of coherent magnons with high momentum in optical cavities. This is achieved by two counterpropagating optical modes that are detuned by the frequency of a selected magnon, similar to stimulated Raman scattering. In sub-mm size yttrium iron garnet spheres, a mW laser input power generates 10 6 − 10 8 coherent magnons. The large magnon population enhances Brillouin light scattering, a probe suitable to access their quantum properties.Magnets are crucial for fast, non-volatile, and robust data storage as well as candidate materials for logic devices and interconnects [1]. Magnetic insulators, such as yttrium iron garnet (YIG) [2], are interesting since they can transport information over long distances via spin waves quantized into magnons [3,4], without the Ohmic dissipation of spin transport in metals. The magnons couple to microwaves [5][6][7], electric currents [1,3,8], mechanical motion [9][10][11][12], and light [13,14]. The high crystal quality of YIG promises long coherence times [6,7], opening prospects for 'quantum magnonics ' [15], the field that strives to employ magnons to store, process, and transfer information in a quantum coherent manner. Photons can become a coherent interface to manipulate and probe these magnons.The GHz magnons in ferro(ferri)magnets interact with light by inelastic (Brillouin) light scattering (BLS) [13]. By selecting the wave vector of the input and output photons, e.g. by an optical cavity, specific magnons modes can be excited [16]. The interaction can be large enough [17,18] to cool [19] or herald (generating single magnon states) [20] them, making BLS a promising probe into their quantum nature. Present experiment focus on the long wavelength 'Walker' (including the 'Kittel') magnons in optical resonators [21][22][23][24][25]. These have a small overlap with the light fields and corresponding low intrinsic scattering efficiency, but become observable because a large magnon density can be resonantly excited by microwaves. On the other hand, magnons with wavelengths ∼ 100 − 500 nm in the dipolar-exchange regime have almost perfect overlap with the photon modes in magnetic spheres [18], but couple only very weakly to microwaves (as do the relevant magnons in magnetic vortices [17]).Here, we propose to coherently pump a large number (∼ 10 6 − 10 8 ) of high-momentum magnons by optical lasers, similar to the resonant excitation of Kittel magnons by microwaves. We exploit the torques exerted by light on the magnetization by the inverse Faraday and Cotton-Mouton effects [26], which are proportional to the intensity of the electric field component [26] or, more precisely, the product of the photon numbers at the incident and scattered frequencies. Exposing the sample to two phase-coherent lasers that differ in frequency by a 1. A (massive) sphere of a magnetic insulator, such as YIG, with a proximity optical coupler, such as a fiber or a prism. Two oppositely propagating laser beams excite two whispering gallery modes with decay rates κ r,b . Th...

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Magnon heralding in cavity optomagnonics

Cited by 63 publications

References 57 publications

Advances in Magnetics Roadmap on Spin-Wave Computing

Advances in Magnetics Roadmap on Spin-Wave Computing

Antiferromagnetic cavity optomagnonics

Coherent pumping of high-momentum magnons by light

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