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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

1.1K
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...
1.1K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.5K
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...
1.5K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.1K
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...
1.1K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.1K
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.
1.1K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

2.3K
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...
2.3K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

42.8K
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.
42.8K

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Updated: Aug 20, 2025

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

14.6K

モードで絡み合ったスピン圧縮原子状態を持つ分散量子センシング

Benjamin K Malia1,2, Yunfan Wu3, Julián Martínez-Rincón1,4

  • 1Department of Physics, Stanford University, Stanford, CA, USA.

Nature
|November 23, 2022
PubMed
まとめ
この要約は機械生成です。

量子センサーネットワークの 空間的に分散された絡み合いにより 性能が向上します この量子絡み方では 局所的な絡み方と比較して ネットワークの精度とスケーラビリティが向上します

さらに関連する動画

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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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

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関連する実験動画

Last Updated: Aug 20, 2025

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

14.6K
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

9.1K
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

8.6K

科学分野:

  • 量子情報科学
  • メトロロジー
  • ネットワーク化された量子システム

背景:

  • 量子センサは 精密タイムキーピング フィールドセンシング 量子通信に不可欠です
  • ネットワーク化された量子センサは 時計同期のような分散したタスクを可能にしますが,性能はしばしばノイズと絡み合いの戦略によって制限されます.
  • 局所的な絡み合いを持つ既存のネットワークは,ネットワークのサイズに最適でないスケーリングを示しています.

研究 の 目的:

  • 空間的に分散されたエンタグレメントが量子センサーネットワークのスケーリングとノイズ性能を改善することを実証する.
  • 共有された量子非破壊測定を用いた量子センサーのネットワークを絡めるための新しい方法を導入する.
  • 原子時計と原子干渉計のプロトコルで接近を検証する

主な方法:

  • 共有された量子非破壊測定を使用して,最大4つのノードからなるネットワークで空間的に分散されたエンタグメントを作成します.
  • 絡み合ったネットワークの精度を局所的な絡み合いと量子投影ノイズ限界で動作するネットワークと比較する.
  • 原子時計と原子干渉計のセンサータイプで絡み合いの戦略を実装し,テストする.

主要な成果:

  • 空間的に分散された絡み合いを持つ開発されたネットワークは,それ以外のネットワークよりも4.5デシベル高い精度を達成しました.
  • 量子投影ノイズ限界で動作するセンサーと比較して11.6デシベルの改善が観察されました.
  • このアプローチは,本質的に差異的なセンサ比較の汎用性と有効性を示した.

結論:

  • 空間的に分散されたエンタグリングは,局所化されたエンタグリングと比較して,量子センサーネットワークに優れたスケーリングとノイズパフォーマンスを提供します.
  • 共有量子非破壊測定技術は ネットワーク化された量子センシングを強化するための 実践的な方法を提供します.
  • この研究は より精密でスケーラブルな分散量子技術への道を開きます