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関連する概念動画

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

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

945
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...
945
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

2.5K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.5K
First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

6.8K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.8K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

862
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...
862
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.0K
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...
1.0K
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

5.0K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
5.0K

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Updated: May 27, 2025

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

Published on: June 8, 2018

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統合マイクロコンブにおける連続変数多部絡み

Xinyu Jia1,2, Chonghao Zhai1, Xuezhi Zhu3

  • 1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing, China.

Nature
|February 19, 2025
PubMed
まとめ
この要約は機械生成です。

研究者たちは 統合された光子チップで 8モードの連続変数絡みを作り コンピューティングやセンシングのような量子技術の 重要な進歩です

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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関連する実験動画

Last Updated: May 27, 2025

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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科学分野:

  • 量子情報科学
  • 統合フォトニクス
  • 量子光学

背景:

  • 大規模な絡み合っている状態は 量子計算,通信,計測学にとって不可欠です
  • 統合量子フォトニクスは,量子状態の生成と操作のためのスケーラブルなプラットフォームを提供します.
  • 離散変数との絡み合いを生成することは困難であり,連続変数のアプローチはより有望である.

研究 の 目的:

  • インテグレーテッドフォトニックチップで 連続変数多部絡みを生成する.
  • 前回のデモの限界を克服するために,それは2つの方法に制限されました.
  • 先進的な量子技術のための統合フォトニクスの可能性を紹介する.

主な方法:

  • 集積された光学チップを使って 量子マイクロコンブを作って マルチモードの圧縮式光学周波数コンブを作りました
  • クモード生成とエンタグリングのために,光の二乗で連続変数エンコーディングを使用します.
  • ヴァン・ロック・フルサワ基準の違反による 超モードの多者絡み合いを証明した.

主要な成果:

  • チップ上の8モードの連続変数エンタグレメントの決定的生成を達成しました.
  • 8モード状態の不可分性を確認した.
  • 何百メガヘルツの サイドバンド周波数で 超モードマルチパートの 絡み合いを証明した
  • 予想されるクラスター状態を近似した,複数の絡み合いの構造を特徴づけた.

結論:

  • この研究は,統合された光子装置で大規模な多重絡みを生成する可能性を実証しています.
  • 量子コンピューティング,ネットワーク,センシングのための連続変数統合フォトニクスの可能性を強調しています.
  • チップ上の光学プラットフォームを使って 拡張可能な量子情報処理の道を開く