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関連する概念動画

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.6K
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...
1.6K
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
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
The de Broglie Wavelength02:32

The de Broglie Wavelength

33.9K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
33.9K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.8K
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...
1.8K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

59.8K
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:
59.8K

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Updated: Feb 24, 2026

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

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スピン輸送のデジタル量子シミュレーション

Yi-Ting Lee1, Bibek Pokharel2,3, Jeffrey Cohn3,4

  • 1University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering, Urbana, Illinois 61801, USA.

Physical review letters
|February 22, 2026
PubMed
まとめ

研究者は,超伝導量子ビット装置上のスピン電流自動相関関数を用いて,量子スピン輸送を確実にシミュレートしました. この突破は,量子輸送現象の直接的な研究を可能にし,以前の制限を克服しました.

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

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

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

  • 量子物理学とは,量子物理学のことです.
  • 凝縮物質物理学 凝縮物質物理学
  • 量子情報科学とは,量子情報科学である.

背景:

  • 量子スピンシステムは,スピントロニックデバイスと量子コンピューティングにとって極めて重要です.
  • スピン輸送の探査は,伝統的にスピン-スピン自動相関関数 (ACF) を使用しています.
  • スピン電流ACFは,より直接的な輸送洞察を提供しますが,計算的には高価です.

研究 の 目的:

  • スピン電流ACFによるスピン輸送の信頼性の高いデジタル量子シミュレーションを実証する.
  • 以前の方法に関連する高いゲートコストを克服するために.
  • 40箇所の1D XXZハイゼンベルクモデルで輸送現象を調査する.

主な方法:

  • 量子シミュレーションのために超伝導量子ビットベースのトランスモン装置を使用しました.
  • 非単位操作とミッド回路測定を用いた直接測定スキームを採用しました.
  • ハダマードテストのような間接的な測定スキームの限界を克服しました.

主要な成果:

  • 失敗前耐性デジタル量子シミュレーションで,スピン電流ACFによるスピントランスポートをうまくシミュレートしました.
  • 超拡散系におけるカルダール・パリシ・ジャングのスケーリングを観測した.
  • 拡散系におけるドリュード重量の消失が確認されました.

結論:

  • プリファルトレランスデジタル量子シミュレーションは,量子輸送現象を研究するための有効なツールです.
  • 中間回路測定を伴う直接測定スキームは,スピントランスポートの探査に有効です.
  • この研究は,1D XXZハイゼンベルクモデルの輸送体制に関する新しい洞察を提供します.