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関連する概念動画

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.5K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.5K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.7K
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...
2.7K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.3K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.3K
Quantum Numbers02:43

Quantum Numbers

47.6K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
47.6K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
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...
1.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.4K
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...
1.4K

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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

9.5K

量子情報処理のための光学的にアドレッシブルな分子スピン

S L Bayliss1, D W Laorenza2, P J Mintun1

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)
|November 13, 2020
PubMed
まとめ
この要約は機械生成です。

研究者らは光学的にアドレッシブルなクロム (IV) 分子を量子技術のために開発した. これらのスピンベアリング分子は 光とマイクロ波で制御され 設計者の量子システムへの道を開きます

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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関連する実験動画

Last Updated: Nov 30, 2025

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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科学分野:

  • 量子技術
  • 分子工学
  • 材料科学

背景:

  • スピンベアリング分子は 調節性とスケーラビリティのため 量子技術の鍵です
  • 基底状態のスピンを光学的に処理することは 量子情報科学にとって重要なことですが 分子にとっては挑戦的でした

研究 の 目的:

  • 分子システムにおける基底状態のスピンの光学的なアドレッサビリティを証明する.
  • 量子応用のための有機金属クロム (IV) 分子を合成し,特徴づけること.

主な方法:

  • 新種の有機金属クロム化合物の合成.
  • 分子基底状態のスピンの光学初期化と読み取り.
  • マイクロ波によるスピン状態のコヒーレント操作
  • 分子構造を原子的に改造して 性質を調整する

主要な成果:

  • 合成クロム (IV) 分子の基底状態のスピンの光学的なアドレッシビリティを証明した.
  • 光ベースのスピン初期化と読み取りを展示しました.
  • 微波を使ってコヘランスなスピン操作を達成した.
  • 構造的な変更によって様々なスピンと光学特性を有する.

結論:

  • 光学的にアドレス可能な分子スピンは実現可能であり,量子情報科学に新しい道を開きます.
  • クロミウム (IV) 分子は量子システムのボトムアップ設計のための有望なプラットフォームを提供します.
  • 調節可能なスピンと光学特性は 量身の定めた量子装置の可能性を示唆しています