関連する実験動画
Updated: Sep 10, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.1K
洞穴マグノニックにおけるコヘランス,分散,非互換性の再構成可能な制御
Jintao Shuai1, Bojong Kim1, Junyoung Kim1
1National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Scientific reports
|August 22, 2025
まとめ
研究者は磁場を回転させることで ハイブリッド量子システムにおける 光子-マグノン結合とダッピングを正確に制御しました この磁場角調整は 再構成可能な量子とスピントロニックデバイスの 協調性と分散を管理する新しい方法を提供します
科学分野:
- 量子物理学
- 凝縮物質物理学
- 材料科学
背景:
- フォトン-マグノンシステムの結合強度,ダッピング率,非相互性に対する正確な制御は,高度なハイブリッド量子技術の開発に不可欠です.
- これらのパラメータを制御するための既存の方法は,しばしば柔軟性がないか,複雑な設定を必要とする.
研究 の 目的:
- 光子-マグノン結合とマグノン分散の磁場角度依存制御を実証する.
- マグノンの性質を操作するために空間的に不均一な電磁場 (rf) の使用を調査する.
- 空間的非対称性を実現するために,従来の段階ベースの方法に加えて
主な方法:
- イットリウム・アイアン・ガーネット (YIG) フィルムでクロス型のマイクロ波腔を使用した.
- 空間的に不均一なrf磁場を適用し,外部磁場 (角 θ) を回転させた.
- 均等な鉄磁共振 (FMR) モードと有限波ベクトルスピン波の興奮を調査した.
主要な成果:
- 磁場の角度を回転させることで,コヒーレントな結合強度,FMRダッピング率,および非相互反応を同時に制御する.
- 通常は損失メカニズムである2マグノンの散乱を動的に制御してマグノンのダッピングを管理できることを実証した.
- RFフィールドの空間的非対称性から生じる非互換性.
結論:
- 磁場角度チューニングは,空洞マグニオニクスの相関性,分散性,非互換性の現地制御のための多用途な方法を提供します.
- これらの発見は,再構成可能な量子とスピントロニックシステムの設計のための新しい道を提供します.
- 2つのマグノン散布によるマグノンダッピングのダイナミック制御は,量子情報処理の新たな可能性を開きます.
関連する概念動画
Magnetic Damping
548
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
548
Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
Biasing of Metal-Semiconductor Junctions
331
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
331
Atomic Nuclei: Nuclear Relaxation Processes
722
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
722
Electromagnetic Waves in Matter
3.4K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
3.4K
Double Resonance Techniques: Overview
291
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
291

