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関連する概念動画

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

980
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...
980
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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...
1.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.0K
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,...
1.0K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.1K
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...
1.1K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

42.9K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
42.9K

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Updated: Aug 11, 2025

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

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

Published on: June 3, 2015

14.8K

シリコンでコードされたスピンクビットを持つ普遍的な論理

Aaron J Weinstein1, Matthew D Reed2, Aaron M Jones2

  • 1HRL Laboratories, LLC, Malibu, CA, USA. ajweinstein@hrl.com.

Nature
|February 6, 2023
PubMed
まとめ
この要約は機械生成です。

電子のスピンを電気的に制御し マイクロ波によるエラーを克服する 新しい量子計算方法を開発しました このアプローチは 誤差を許容する量子計算と 性能の向上への有望な経路を提供します

さらに関連する動画

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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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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関連する実験動画

Last Updated: Aug 11, 2025

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

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

Published on: June 3, 2015

14.8K
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.7K
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

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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:

  • 量子コンピューティングはノイズと不完全な制御によるエラーにより課題に直面し,故障耐性を阻害します.
  • 量子ビットのマイクロ波制御によって引き起こされる相関エラーは,多くの量子ビット技術にとって重要な障害です.
  • 既存の方法は,誤差を許容する量子計算のための厳格なエラー特徴と相関管理を必要とします.

研究 の 目的:

  • 量子計算の代替方法として,エネルギーが劣化した量子ビット状態を用いる.
  • 微波に関連した誤差源を回避して 普遍的な量子制御を実現する
  • 量子コンピューティングにおけるスケーラブルな故障耐性を探求する.

主な方法:

  • 部分スピンスワップのための近隣コンタクトインタラクションによって制御されるエネルギー退化型エンコードされた量子ビット状態を使用した.
  • 完全電気制御を可能にする部分スワップの調整されたシーケンスに電圧パルスを使用します.
  • 拡張可能なプラットフォームで28Si/SiGeの量子ドットを使って 6ビット配列を製造した.

主要な成果:

  • 2つのエンコードされた量子ビットの 普遍的な量子制御を達成し マイクロ波関連の相関エラーを回避しました
  • インターリーブ・ランダム・ベンチマークを用いて定量化された運用精度:96.3% ±0.7% 暗号化されたCNOT, 99.3% ±0.5% 暗号化されたSWAP.
  • 高い量子コヘランスと 低クロスストーク制御を 部分スワップ操作で証明した.

結論:

  • 部分スワップを用いた全電気制御法が開発され,故障耐性量子計算への強力な経路を提供している.
  • 濃縮シリコンの量子コヒーレンスと 電気制御と エラー無感のエンコーディングは 量子コンピューティングの重要な課題を解決します
  • このアプローチは,スケーラブルな故障耐性を達成し,計算上の優位性を解き放つための強力な基盤を提供します.