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関連する概念動画

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.3K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.3K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
Social Exchange Theory02:06

Social Exchange Theory

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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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関連する実験動画

Updated: Feb 7, 2026

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS

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共振交換量子ビットを使ったコヘランス・スピン・フォトン・カップリング

A J Landig1, J V Koski2, P Scarlino2

  • 1Department of Physics, ETH Zürich, Zurich, Switzerland. alandig@phys.ethz.ch.

Nature
|July 27, 2018
PubMed
まとめ

研究者は単一のマイクロ波光子と 3電子スピン量子ビットとの強い結合を達成しました この画期的な発見は,量子計算のためのスピン量子ビットの 協調的な長距離結合を可能にすることで,量子情報処理を進めている.

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Last Updated: Feb 7, 2026

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
12:56

Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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科学分野:

  • 量子情報科学
  • 固体物理学
  • 量子コンピューティング

背景:

  • 電子のスピンは長いコヒーレンス時間のために量子計算に有望である.
  • 距離のスピンのコヒーレントカップリングはスケーラブルな量子情報処理に不可欠です
  • フォトンは量子情報伝達器として機能し 遠隔スピン相互作用を可能にします

研究 の 目的:

  • 単一のマイクロ波光子と3電子のスピンクビットとの強い結合を証明する.
  • 量子ビット-光子結合の強さと量子ビットの脱合率を調査する.
  • 量子ビットの電気二極モメントへの依存を 探求する

主な方法:

  • ナイオビウム・タイタニウム・ナトリド高阻力共振器と 3つの量子ドットを持つガリウム・アルセニド装置を用いて
  • 強い結合の証拠として,真空ラビモードの分裂を観察する.
  • 量子ビット-光子結合の強さの依存度を測定するために AC スターク効果を使用します.

主要な成果:

  • 単一のマイクロ波光子と3電子スピン量子ビットとの強い結合を達成しました.
  • 約31MHzのコヒーレントカップリング強度と約20MHzの量子ビットの脱コヒーレンス率を観測した.
  • ~23MHzのカップリング強度で,最低速度の~10MHzまでデコヘレンスの静電チューニングが実証されています.

結論:

  • 強力な量子ビット-光子カップリングの実証は,一貫した長距離スピン量子ビットカップリングの重要な進歩です.
  • この研究は,スケーラブルな量子ネットワークと,スピン量子ビットを用いた分散量子コンピューティングの道を開きます.
  • 量子システムに 精密な制御を 提供します