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関連する概念動画

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...
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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,...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Protein-Protein Interfaces02:04

Protein-Protein Interfaces

4.5K
4.5K
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
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

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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シリコンでコヒーレントなスピンフォトンインターフェース

X Mi1, M Benito2, S Putz1

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Nature
|February 15, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は,シリコン電子のスピンとマイクロ波の光子との強い結合を達成し,長距離量子接続を可能にしました. この画期的な発見により 量子コンピューティングは スケール可能で フォトンの通りの全量子ビットの接続が可能になります

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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科学分野:

  • 量子コンピューティング
  • 量子情報科学
  • 固体物理学

背景:

  • シリコン量子ドットは 量子コンピューティングに 長いコヒーレンス時間とスケーラビリティを提供します
  • 近隣結合のような 現在の方法は量子ビットの接続性を制限します
  • フォトンによる長距離スピン-スピンカップリングを実現することは 量子プロセッサにとって極めて重要です

研究 の 目的:

  • シリコンとマイクロ波周波数フォトンの 強い,一貫した結合を証明する.
  • スピン・フォトンの相互作用における小さな磁気二極モメントの限界を克服する.
  • スピンベースの量子プロセッサーの 相互接続を可能にします

主な方法:

  • 磁場グラデーションでスピン・チャージ・ハイブリデーションを利用して,スピン・フォトンの相互作用を高める.
  • マイクロ波周波数フォトンを使って スピン・スピン・カップリングを媒介する.
  • 単一回転のための一貫した制御と分散的な読み取り技術を実装する.

主要な成果:

  • 10メガヘルツを超える強力なスピン・フォトンのカップリング速度を達成し,以前の方法よりも大幅に高い.
  • シリコンの個々の電子スピンの一貫した制御と分散的な読み取りを証明した.
  • 遠くのスピン間の相互作用を媒介する 有効なメカニズムを確立した.

結論:

  • 証明された強力なスピンフォトン結合は,フォトンを用いて単一のスピンを絡めるための直接的な経路を提供します.
  • この研究により 拡張可能な量子プロセッサの 基礎を築くことができます
  • シリコン量子ドット技術の進歩は加速し 量子コンピューティングの実用化も進んでいます