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関連する概念動画

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Transitions01:21

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
Phase Changes01:19

Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...

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関連する実験動画

Updated: Jul 5, 2026

Production and Targeting of Monovalent Quantum Dots
10:16

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

制御されたフェーズシフトは,単一の量子ドットで実行されます.

Ilya Fushman1, Dirk Englund, Andrei Faraon

  • 1Applied Physics, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|May 10, 2008
PubMed
まとめ
この要約は機械生成です。

ナノキャビティ内の単一の量子ドットは,量子技術の制御された光子対光子相互作用を可能にします. この量子ドットシステムは,単一の光子レベルで相と振幅の調節を実証し,チップ上の量子装置への道を開く.

さらに関連する動画

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

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

関連する実験動画

Last Updated: Jul 5, 2026

Production and Targeting of Monovalent Quantum Dots
10:16

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

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

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

科学分野:

  • 量子光学とは,量子光学である.
  • 固体物理学 固体物理学とは
  • ナノフォトニクス ナノフォトニクス

背景:

  • 光学非線形性は,光子対光子相互作用において極めて重要であり,量子情報処理と光学信号処理の基盤となっている.
  • 現在の最先端の非線形性は,主に単一の原子や原子組を用いて達成される.

研究 の 目的:

  • 量子ドットフォトニック結晶ナノキャビティシステムを用いて単光子レベルで制御された光相および振幅調節を実証する.
  • オンチップ量子光学装置のための固体量子エミッターの可能性を調査する.

主な方法:

  • 単一の量子ドットと光子結晶のナノ空間に結合する.
  • コントロールビームの制御フォトン数を活用して,変調を誘導する.
  • 制御ビームの波長を信号ビームと比較して変化させる.

主要な成果:

  • 2つの光モードの間の制御された相と振幅の調節を単光子レベルで達成した.
  • 観測されたフェーズシフトはpi/4まで,振幅調節は最大50%まで,制御力は大きい.
  • オン共振とデトゥーン制御波長の両方を用いてモジュレーションが実証されました.

結論:

  • ナノキャビティに結合された単一の量子ドットは,強力な非線形光学要素として機能することができます.
  • このシステムは,量子情報処理と量子非破壊測定のためのスケーラブルなオンチッププラットフォームを提供します.
  • この結果は,集積量子論理装置に向けた重要な進歩を表しています.