Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

974
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.
974
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

938
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...
938
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.0K
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...
1.0K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

651
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
651
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

330
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
330
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

913
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...
913

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
Same author

Scalable Quantum Current Source on Commercial CMOS Process Technology.

Nano letters·2026
Same author

Characterising the failure mechanisms of error-corrected quantum logic gates.

Nature communications·2026
Same author

Fully autonomous tuning of a spin qubit.

Nature electronics·2026
Same author

Radiofrequency cascade readout of coupled spin qubits.

Nature electronics·2026
Same author

Coupling a single spin to the motion of a carbon nanotube.

Nature communications·2025
Same journal

Retraction Note: NSD2 targeting reverses plasticity and drug resistance in prostate cancer.

Nature·2026
Same journal

Enhanced B cell priming induces broadly neutralizing HIV-1 apex antibodies.

Nature·2026
Same journal

Vaccination elicits HIV broadly neutralizing antibodies in primates.

Nature·2026
Same journal

Child online safety needs more than social-media bans.

Nature·2026
Same journal

Ebola preparedness must start with ecosystems and before humans show symptoms.

Nature·2026
Same journal

AI tools can speed up thinking, but evidence still comes from the lab bench.

Nature·2026
関連記事をすべて見る

関連する実験動画

Updated: Jun 29, 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

14.6K

高精度スピン量子ビット操作と1K以上のアルゴリズム初期化

Jonathan Y Huang1, Rocky Y Su2, Wee Han Lim2,3

  • 1School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, New South Wales, Australia. yue.huang6@unsw.edu.au.

Nature
|March 28, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは,1ケルビン以上のシリコンでスピン量子ビットの高精度動作を実証した. この画期的な発見は 熱的限界を克服することで 拡張可能な量子コンピューティングを可能にし 欠陥を許容する量子コンピュータへの道を切り開きます

さらに関連する動画

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
08:55

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

5.6K
Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

12.8K

関連する実験動画

Last Updated: Jun 29, 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

14.6K
High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
08:55

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

Published on: October 9, 2020

5.6K
Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

12.8K

科学分野:

  • 量子コンピューティング
  • 半導体物理学
  • 量子情報科学

背景:

  • 半導体スピン量子ビットは 量子コンピュータへのスケーラブルな経路を提供します
  • 高量子ビットの数は 現在の冷却能力を超える熱負荷を生成します
  • 誤差を許容する量子操作は,スケーラビリティのために1ケルビン以上が必要です.

研究 の 目的:

  • シリコンのスピン量子ビットの高精度操作を 証明する
  • ハイフィデリティの操作で量子ビットのエネルギーを超える熱エネルギーの制限を克服する.
  • スケーラブルで故障を許容する 量子コンピューティングを進めるために

主な方法:

  • シリコンでスピン量子ビットを調節し操作する
  • 純粋な2量子ビット状態のためのアルゴリズム初期化プロトコルの開発
  • 量子ビットの初期化と測定に ラジオ周波数読み取りを使用します

主要な成果:

  • 読み取りと初期化に99.34%のフィデリティを達成しました.
  • シングル・クイビット・クリフォード・ゲート 99.85%まで
  • 2キビットゲートの精度は98.92%だ

結論:

  • 高精度スピン量子ビットの操作は1ケルビン以上で可能であり,重要なスケーラビリティの障害を克服します.
  • 証明された技術は 欠陥耐性量子計算を可能にするために不可欠です
  • この研究は,大規模で商業的に実用的な量子コンピュータの開発を大幅に前進させています.