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関連する概念動画

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

1.4K
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
1.4K
The Entropy as a State Function01:14

The Entropy as a State Function

21
Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...
21
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

3.3K
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.
3.3K
Phase Transitions01:21

Phase Transitions

27
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...
27
Phase Transitions02:31

Phase Transitions

23.5K
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...
23.5K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

4.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
4.1K

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関連する実験動画

Updated: Mar 7, 2026

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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量子相変遷を駆動する際の決定的絡み生成

Xin-Yu Luo1, Yi-Quan Zou1, Ling-Na Wu1

  • 1State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China. lyou@mail.tsinghua.edu.cn mengkhoon_tey@mail.tsinghua.edu.cn.

Science (New York, N.Y.)
|February 11, 2017
PubMed
まとめ
この要約は機械生成です。

研究者らは量子相変換を用いて大規模な 絡み合ったツインフォック濃縮物を作りました この方法は高度な量子技術の 役に立つ絡み合いを生成するための 堅固な方法を提供します

さらに関連する動画

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

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

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関連する実験動画

Last Updated: Mar 7, 2026

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

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

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

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科学分野:

  • 量子物理学
  • 原子物理学
  • 多体システム

背景:

  • 量子技術においては 複数体の絡み合いは重要ですが 作り上げたり維持したりするのは 難しいものです
  • 非線形相互作用は絡み合いを生み出しますが,劣化も引き起こします.
  • 量子力学を制御することは 絡み合いを利用する鍵です

研究 の 目的:

  • 大規模な絡み合ったツインフォック凝縮物のほぼ決定的生成を実証する.
  • 量子フェーズトランジション (QPT) を利用して 頑丈なエンタグリングを作成します
  • 生成された絡み合いとその潜在的な応用を定量化します.

主な方法:

  • ルビジアム-87のボース・アインシュタイン凝縮液を スピン混合に駆動する
  • 連続した2つの量子相移行 (QPT) を利用する.
  • 数字の圧縮と集団の回転の長さを直接観察する.

主要な成果:

  • 約11,000個の原子を持つ絡み合ったツインフォック凝縮物の生成.
  • 10.7 ± 0.6デシベルの数値圧縮が観察されました.
  • 0.99 ± 0.01の標準化された集団スピン長さを測定した.
  • 標準量子限度 (~6dB) を超えた推論された絡み合いの強化相感度.
  • 約910原子の絡み合い幅を決定した.

結論:

  • 量子相変換は 広範囲で有用な 絡み合いを生成する強力なツールです
  • 証明された方法は,絡み合いの劣化を克服するための経路を提供します.
  • この研究は量子センシングと計算のための 絡み合った状態の創造を進めるものです