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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

993
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
993
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
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...
1.9K
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: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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,...
1.2K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.9K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.5K
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...
1.5K

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Updated: May 3, 2026

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

Published on: June 3, 2015

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固体ハイブリッドスピンレジスタにおける量子エラー補正

G Waldherr1, Y Wang1, S Zaiser2

  • 11] 3. Physikalisches Institut and Research Center SCOPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany [2].

Nature
|January 31, 2014
PubMed
まとめ
この要約は機械生成です。

量子エラー補正はダイヤモンドスピンシステムで実証されており,スケーラブルな量子計算のための高精度操作を可能にします. これらの技術は,量子コンピューティングとネットワークの進歩に不可欠です.

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関連する実験動画

Last Updated: May 3, 2026

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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科学分野:

  • 量子コンピューティング
  • 固体物理 固体物理学
  • 量子情報科学とは,量子情報科学である.

背景:

  • 量子計算は,環境の相互作用による非相関性を軽減するために,エラー訂正に依存しています.
  • 量子エラー補正の実験的実現は,スケーラブルな量子システムにとって重要な課題であり続けています.

研究 の 目的:

  • 固体スピン系における異質的な量子誤差補正を実証する.
  • 環境条件下での高精度量子操作を展示する.

主な方法:

  • 窒素空白欠陥の電子スピンを利用して,核スピンの共同初期化と投射的読み取りを行う.
  • 電子核量子レジスタのための新しい局所および非局所ゲート操作の実装.
  • ハイフィデリティの操作に最適な制御技術を採用する.

主要な成果:

  • スピン・レジスタの初期化と複数の核スピンの単発読み取りで 99% の精度を達成しました.
  • 精度85%を超える3つの核スピンの準備された絡み合った状態.
  • 証明された3量子ビットのフェーズフリップエラー補正で,信頼性は故障耐性の値に近づいています.

結論:

  • 開発された技術は,スケーラブルな量子コンピューティングと量子ネットワークにとって不可欠です.
  • この方法は,ダイヤモンド以外の様々な固体スピンシステムにも適用できます.
  • この研究は,故障耐性量子操作と大規模量子コンピューティングへの道を開く.