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関連する概念動画

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

7.5K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
7.5K
Joule-Thomson Effect01:21

Joule-Thomson Effect

10.2K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
10.2K
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

4.8K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
4.8K
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

1.4K
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
1.4K
Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

4.1K
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 medium, μ.
Furthermore,...
4.1K
Electromagnetic Waves01:30

Electromagnetic Waves

11.7K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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関連する実験動画

Updated: Feb 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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ジョセフソン効果による一貫したマイクロ波の生成.

Angelo Greco1, Xavier Ballu2, Francesco Giazotto2

  • 1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Pisa, Italy. angelo.greco@nano.cnr.it.

Nature communications
|February 20, 2026
PubMed
まとめ

研究者らは,超伝導回路を用いた新しいマイクロ波周波数コンブジェネレーターを実証した. このオンチップデバイスは,ACジョセフソン効果を活用して,正確なギガヘルツからテラヘルツの周波数を生成し,量子技術の道を開く.

さらに関連する動画

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

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関連する実験動画

Last Updated: Feb 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.8K
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

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科学分野:

  • 固体物理学 固体物理学とは
  • 量子光学とは,量子光学である.
  • マイクロウェーブ技術とは

背景:

  • 光学周波数は,正確な測定ツールです.
  • 超伝導回路は,周波数を生成するための低分散プラットフォームを提供します.
  • 先進的なアプリケーションでは,周波数のオンチップ統合が望ましい.

研究 の 目的:

  • 超伝導回路を使用して一貫したマイクロ波周波数を生成することを実証する.
  • オンチップコンブエミターにおけるACジョセフソン効果の可能性を調査する.
  • 超伝導周波数の性能とスケーラビリティを評価する.

主な方法:

  • 超伝導量子干渉装置 (SQUID) を利用した.
  • 周期的な電圧パルスを生成するために,時間依存の磁気ドライブを適用しました.
  • 周波数領域で生成された電圧パルスを分析して,の性質を特徴づけました.

主要な成果:

  • 数十のスペクトルモード (モード46まで) を含む一貫したマイクロ波周波数カム生成を達成しました.
  • 観測された放出力は,各ハーモニクあたり -170 dBm から -130 dBm までであった.
  • 4-8GHz帯域幅内で40dBのダイナミックレンジを示した.
  • マイクロメートルスケールの装置を最小限の消耗で製造しました.

結論:

  • 超伝導回路は,チップ内マイクロ波周波数の生成のための実行可能なプラットフォームを提供します.
  • ACジョセフソン効果は,これらのを作るための重要なメカニズムです.
  • 開発された技術は,冷凍電子技術や量子技術との統合に有望である.