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Related Concept Videos

Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

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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...
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The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the...
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In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Scientists refer to the measure of randomness or disorder within a system as entropy. High entropy means high disorder and low energy. To better understand entropy, think of a student’s bedroom. If no energy or work were put into it, the room would quickly become messy. It would exist in a very disordered state, one of high entropy. Energy must be...
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Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
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A model of entropy production.

Andreas Schlatter1,2, R E Kastner3,4

  • 1The Quantum Institute, Gloversville, United States.

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Photon absorption in quantum mechanics localizes systems, reducing information entropy. This study models entropy production during absorption, linking information and thermodynamic entropy, and quantum probabilities.

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Area of Science:

  • Quantum Mechanics
  • Thermodynamics
  • Information Theory

Background:

  • The Transactional Interpretation of Quantum Mechanics posits that photon absorption localizes the absorbing system.
  • This localization implies a measurement of the absorber's position, potentially reducing information entropy.

Purpose of the Study:

  • To clarify the relationship between information entropy and thermodynamic entropy.
  • To develop a rigorous model for entropy production in photon-absorption processes.
  • To explore connections to quantum probability interpretation and Maxwell's demon.

Main Methods:

  • Critical analysis of the physics of information erasure.
  • Development of a rigorous thermodynamic model for photon absorption.
  • Investigating the implications for quantum measurement and entropy.

Main Results:

  • Established a clear link between information entropy reduction and thermodynamic entropy production during photon absorption.
  • Provided a rigorous model quantifying entropy changes in these quantum processes.
  • Connected these findings to the interpretation of quantum probabilities.

Conclusions:

  • Photon absorption acts as an entropy-reducing process concerning information, necessitating compensatory entropy production.
  • The study offers insights into fundamental concepts like quantum measurement, information erasure, and thermodynamic principles.
  • The findings have implications for understanding quantum probabilities and paradoxes like Maxwell's demon.