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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

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

Spin–Spin Coupling: One-Bond Coupling

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

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

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...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

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関連する実験動画

Updated: Jun 10, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

光学フォトンと固体スピン量子ビットとの間の量子絡み.

E Togan1, Y Chu, A S Trifonov

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|August 6, 2010
PubMed
まとめ

研究者は,単一の光学光子と固体量子ビットとの間の量子絡み合いを達成しました. この量子ネットワークの突破は,高度な量子通信と基礎研究のためにダイヤモンドの窒素空白センターを利用しています.

さらに関連する動画

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

関連する実験動画

Last Updated: Jun 10, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 量子情報科学とは,量子情報科学である.
  • 固体物理 固体物理学

背景:

  • 量子絡み合いは,量子力学の重要な現象であり,量子情報処理に不可欠である.
  • 絡み合った光子は,量子暗号と量子力学の基本的テストに不可欠です.
  • 以前の研究では,量子ネットワークのために光子と原子,イオンが絡み合っていたが,固体統合は依然として課題だった.

研究 の 目的:

  • 単一の光学フォトンと固体量子ビットとの間の量子エンタグリングを確立するために.
  • 量子光学ネットワークのための新しい絡み合い源を実証する.
  • 固体系の光物質相互作用の高度な制御を披露する.

主な方法:

  • ダイヤモンドの窒素空白 (NV) センターのスピンと絡み合った単一の光学フォトンを利用しました.
  • 量子エレーザー技術を使用して,絡み合いの実験的検証を行いました.
  • フォトンの極化とNVセンターの電子回転に焦点を当てた.

主要な成果:

  • フォトンの二極化と固体量子ビット (NVセンター) の間の量子絡みを成功裏に実現しました.
  • 固体量子ビットと量子光場との相互作用において高いレベルの制御を示した.
  • 量子エレーザー技術を用いて,量子相関を確認した絡み合い.

結論:

  • 開発された絡み合い源は,固体量子光学ネットワークに向けた重要な一歩です.
  • この研究は,将来の量子通信および計算システムのための重要な構成要素を提供します.
  • 光と物質の相互作用の制御が実証されていることは,基本的な量子研究のための新しい道を開く.