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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

1.3K
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...
1.3K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.4K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.4K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

3.8K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
3.8K
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

56.5K
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:
56.5K
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
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.2K
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...
2.2K

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

3.0K

クビット・スピン・アイス

Andrew D King1, Cristiano Nisoli2, Edward D Dahl3,4

  • 1D-Wave Systems, Burnaby, British Columbia V5G 4M9, Canada. aking@dwavesys.com cristiano@lanl.gov.

Science (New York, N.Y.)
|July 30, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は超伝導量子ビットを用いて 量子と熱の変動を観察して 人工スピン氷を設計しました コロンブ・フェーズを制御し,ガウス・フェーズを制御した.

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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科学分野:

  • 凝縮物質物理学
  • 量子情報科学
  • ナノテクノロジー

背景:

  • 人工のスピンアイスシステムは 浮遊現象を呈する 挫折した磁石を設計したものです
  • 従来の人工のスピンアイスは 伝統的な磁気相互作用に依存しています
  • 量子効果と熱の変動は このようなシステムに 新しい振る舞いを導入できます

研究 の 目的:

  • 超伝導量子ビットの格子の中で人工のスピンアイスを認識し特徴づけること
  • 量子と熱の変動を 量子ビットのスピン氷で調べる
  • クーロン・フェーズや磁気モノポールの 制御を証明する

主な方法:

  • 超伝導量子ビットの製造 スピンアイスを模倣するように設計された
  • 量子と熱の変動を利用して システムを乱す
  • 精密な量子ビットの制御で スピンの状態を操作し 発生特性を探査します

主要な成果:

  • 超伝導クビットを使って 乱れた人工スピン氷のシステムを作りました
  • 古典的な氷の法則と一致する 基本状態が観測されました 変動によって修正されました
  • 脆弱な変性点を制御して クーロン相を誘発した
  • 個々のスピンを固定することで,発生磁気モノポールのガウスの法則を証明した.

結論:

  • 超伝導量子ビットは人工スピン氷の実現と研究のための調整可能なプラットフォームを提供します.
  • このシステムは,クーロン相と有効な独占を含む制御可能な新興現象を示している.
  • この研究は,量子スピン液体と工学システムにおけるトポロジック現象の探索への道を開きます.