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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
Titration Calculations: Strong Acid - Strong Base02:28

Titration Calculations: Strong Acid - Strong Base

34.2K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
34.2K

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

8.9K

シリコンの強いスピンフォトン結合

N Samkharadze1, G Zheng1, N Kalhor1

  • 1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.

Science (New York, N.Y.)
|January 27, 2018
PubMed
まとめ
この要約は機械生成です。

研究者達は シリコンの量子ドットから 単一の電子のスピンを マイクロ波の光子と結びつけました これはスピン量子ビットを使った 量子コンピュータの拡張に向けた 重要な一歩を示しています

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Fabrication and Testing of Photonic Thermometers
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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
  • 超伝導回路

背景:

  • シリコン量子ドットにおける単一のスピンは 長いコヒーレンス時間を提供し 量子計算に有望です
  • スピン量子ビットシステムのスケールアップは 実践的な量子コンピュータの開発において重要な課題です

研究 の 目的:

  • 電子のスピンとマイクロ波のフォトンの強い結合を証明する.
  • 量子ドットベースのスピン量子ビットネットワークのスケーラブルなアーキテクチャのための基礎的なステップを確立する.

主な方法:

  • シリコンのダブル量子ドットの中に 単一の電子のスピンを閉じ込めます
  • 単一のマイクロ波フォトンを保存するために,チップ上の高インペデンス超伝導共振器を使用します.
  • 電子の電荷二極と結合し,局所磁場グラデーションを通じて間接的にスピンを利用する.

主要な成果:

  • 単一の電子スピンと単一のマイクロ波フォトンの間の強いカップリングを達成しました.
  • 制御可能な相互作用メカニズムは 電気と磁場の両方のコンポーネントによって媒介されます.

結論:

  • 証明された強いカップリングは 量子ドットを接続するための 実行可能な経路を提供します
  • この研究は,量子計算のためのスケーラブルな量子レジスタを構築するための重要なステップです.