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Related Concept Videos

Phase Transitions02:31

Phase Transitions

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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...
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Phase Transitions01:21

Phase Transitions

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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...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Phase Changes01:19

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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.
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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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Quantum coherence and quantum phase transitions.

Yan-Chao Li1, Hai-Qing Lin2

  • 1College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

Scientific Reports
|May 20, 2016
PubMed
Summary
This summary is machine-generated.

Local quantum coherence (LQC) effectively detects quantum phase transitions (QPTs) in various models. It also works at finite temperatures, outperforming quantum discord when entanglement fails.

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Area of Science:

  • Quantum Information Theory
  • Condensed Matter Physics

Background:

  • Quantum phase transitions (QPTs) signify abrupt changes in quantum systems.
  • Local quantum coherence (LQC) quantifies quantum correlations.
  • Wigner-Yanase skew information is a measure of LQC.

Purpose of the Study:

  • To investigate the relationship between LQC and QPTs.
  • To assess LQC's efficacy in detecting various QPTs across different models.
  • To compare LQC with quantum discord (QD) at finite temperatures.

Main Methods:

  • Applying LQC derived from Wigner-Yanase skew information.
  • Analyzing one-dimensional Hubbard, XY spin chain, and Su-Schrieffer-Heeger models.
  • Evaluating LQC and QD at finite temperatures.

Main Results:

  • LQC successfully detects different types of QPTs in spin and fermionic systems.
  • LQC remains effective at finite temperatures, unlike entanglement.
  • LQC exhibits distinct behaviors compared to QD.

Conclusions:

  • LQC is a robust indicator of QPTs across diverse quantum models.
  • LQC offers advantages over entanglement and QD in specific thermal regimes.
  • LQC provides a valuable tool for characterizing quantum phase transitions.