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Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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 contribute to...
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...

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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

核磁共振を用いた幾何学的量子計算

Jones1, Vedral, Ekert

  • 1Centre for Quantum Computation, Clarendon Laboratory, Oxford, UK. jonathan.jones@qubit.org

Nature
|March 8, 2000
PubMed
まとめ
この要約は機械生成です。

研究者らは,条件付きベリー相を用いて,故障耐性量子論理ゲートを実証した. この核磁共振実験は,量子情報処理の強力な方法を示し,量子コンピューティングの能力を強化しています.

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 2, 2013

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

関連する実験動画

Last Updated: May 22, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

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

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 2, 2013

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

科学分野:

  • 量子情報科学とは,量子情報科学である.
  • 量子コンピューティング
  • 実験物理学の物理

背景:

  • 量子コンピューティングの可能性は,古典的なチューリングマシンを上回り,故障耐性量子論理ゲートが必要になります.
  • 量子論理ゲートには条件付き量子ダイナミクスが必要で,しばしば相変化が伴う.
  • フェーズシフトは幾何学的な (ベリーフェーズ) であり,エラーに対する回復力を提供します.

研究 の 目的:

  • 量子情報処理のための条件付きベリー相を実験的に実装する.
  • 幾何学的な相を用いた故障耐性量子ゲート操作を実証する.
  • 核磁気共鳴技術と幾何学的相概念を組み合わせる.

主な方法:

  • 核磁共振 (NMR) 技術を活用した.
  • 条件付き幾何学的 (ベリー) フェーズシフトを実装しました.
  • サブシステム状態に依存する制御された量子進化のための実験を設計しました.

主要な成果:

  • 制御されたフェーズシフトゲートを成功裏に実証しました.
  • NMR実験で条件付きベリー相を実装しました.
  • 本質的に故障を許容する量子ゲート操作の可能性を示した.

結論:

  • 条件付き幾何学相は,故障耐性量子コンピューティングへの有望な経路を提供します.
  • NMRは,高度な量子ゲート操作を実装するための実行可能なプラットフォームです.
  • この研究は,強固な量子情報処理の実験的実現を前進させる.