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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

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

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

1.2K
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...
1.2K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
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,...
1.1K
Quantum Numbers02:43

Quantum Numbers

43.8K
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.
43.8K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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

The Pauli Exclusion Principle

53.3K
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:
53.3K

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Updated: Oct 6, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

9.8K

表面コードの値を超えたスピン量子ビットによる量子論理

Xiao Xue1,2, Maximilian Russ1,2, Nodar Samkharadze1,3

  • 1QuTech, Delft University of Technology, Delft, The Netherlands.

Nature
|January 20, 2022
PubMed
まとめ
この要約は機械生成です。

研究者は,シリコン量子プロセッサのシングルと2量子ビットのゲートで99.5%以上の精度を達成しました. この高精度量子制御の突破は 欠陥耐性量子コンピューティングの道を開きます

さらに関連する動画

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

16.5K
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

10.1K

関連する実験動画

Last Updated: Oct 6, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

9.8K
Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

16.5K
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

10.1K

科学分野:

  • 量子コンピューティング
  • 半導体物理学

背景:

  • 高精度量子ビット (量子ビット) コントロールは,信頼性の高い量子アルゴリズムと故障耐性を確保するために不可欠です.
  • 半導体スピン量子ビットの主要な目標は,スケーラブルな量子プロセッサにとって,99%以上の2量子ビットのゲートフィデリティを達成することです.
  • 主要な量子エラー修正コードである表面コードは,約1%未満のエラーレートを要求します.

研究 の 目的:

  • シリコンのスピンベースの量子プロセッサを 特殊な高単位と2量子ビットのゲートフィデリティで実証する
  • これらの高精度ゲートの性能を評価し,クロスストークとアイドルエラーを含みます.
  • 高精度ゲートセットを使って 複雑な量子アルゴリズム,変数量子エイゲンソルバーを実行します.

主な方法:

  • スピンベースの量子プロセッサの製造と操作.
  • ゲートセットトモグラフィーを利用して,単位と2量子ビットのゲートフィデリティを正確に測定します.
  • 分子基底状態エネルギー計算のための変数量子エイゲンソルバーアルゴリズムの実装.

主要な成果:

  • シングルと2キビットゲートの精度が99.5%を超えています.
  • 平均単一量子ビットのゲートの精度が99%以上維持され,クロスストークとアイドルエラーを考慮してもよい.
  • ハイフィデリティゲートの実用性を実証した.

結論:

  • 開発されたシリコン量子プロセッサーは 欠陥耐性の重要なマイルストーンである 99%の2キビットゲートフィデリティの値を超えています
  • 半導体スピン量子ビットは 欠陥耐性量子コンピューティングの進歩に 強く位置づけられています
  • これらの高精度ゲートは 騒々しい中間スケールの量子装置の 現在の時代での応用に 期待されています