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関連する概念動画

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
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

5.0K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
5.0K
Properties of Continuous Functions01:29

Properties of Continuous Functions

211
Continuous functions exhibit smooth, uninterrupted behavior, and combining them through standard operations retains this continuity. If f and g are continuous at a point a, then the functions f+g, f-g, cf (where c is a constant), fg, and fg (provided g(a)a) are also continuous at a. This allows the construction of complex functions from simpler continuous parts without losing smoothness.Polynomials, which are expressions formed by sums of powers of x with constant coefficients, are continuous...
211
Path Between Thermodynamics States01:21

Path Between Thermodynamics States

4.2K
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
4.2K
Standard Entropy Change for a Reaction03:00

Standard Entropy Change for a Reaction

25.3K
Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
25.3K
Reversible and Irreversible Processes01:14

Reversible and Irreversible Processes

6.0K
The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
6.0K

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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連続変数の絡み合いのエルゴトロピク特性

Beatriz Polo-Rodríguez1, Federico Centrone1,2, Gerardo Adesso3

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Avinguda Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain.

Physical review letters
|February 22, 2026
PubMed
まとめ
この要約は機械生成です。

抽出可能な作業の尺度であるエルゴトロピーを用いた新しい方法を導入し,量子システムにおける絡み合いを検出します. このエルゴトロピーに基づく基準は,光学プラットフォームにおける量子相関を理解するために,エントロピー測定の代替案を提供します.

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関連する実験動画

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科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 熱力学は熱力学である.
  • 量子情報科学とは,量子情報科学である.

背景:

  • ガウスの体制における連続変数量子熱力学は,光学系における量子相関を調査する.
  • 単位操作による最大抽出作業であるエルゴトロピーは,熱力学における重要な量である.

研究 の 目的:

  • 双重ガウスの状態における絡み合いの検出のためのエントロピーのない基準を導入する.
  • 絡み合いとエネルギー貯蔵の間の直接的な運用リンクを確立する.

主な方法:

  • グローバルとローカルのエルゴトロピーの格差を定量化するために",相対的なエルゴトロピクギャップ"を定義する.
  • 分離可能な状態から絡み合った状態を区別するために,2つの独立した分析境界を導出します.
  • 分析を特定の非ガウスの状態に拡張する.

主要な成果:

  • エントロピー測定から解放された,エルゴトロピーに基づく絡み合いの検出基準を開発しました.
  • 量子状態の広範なクラスに必要で十分な境界を導出しました.
  • ガウスのエルゴトロピーは,絡み合った非ガウスの状態の熱力学シグネチャーを反映していることが観察されました.

結論:

  • ergotropicアプローチは,エントロピーに基づく測定と比較して,量子相関の異なる側面を捉えます.
  • この方法は,連続変数光学プラットフォームにおける絡み合いの検出に実験的にアクセス可能なアプローチを提供します.
  • 量子システムにおける絡み合いとエネルギー貯蔵の間の直接的なリンクを確立した.