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Related Concept Videos

Maxwell's Equation Of Electromagnetism01:29

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James Clerk Maxwell (1831–1879) was one of the major contributors to physics in the nineteenth century. Although he died young, he made major contributions to the development of the kinetic theory of gases, to the understanding of color vision, and to understanding the nature of Saturn's rings. He is probably best known for having combined existing knowledge on the laws of electricity and magnetism with his insights into a complete overarching electromagnetic theory, which is...
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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Maxwell's Thermodynamic Relations01:23

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Maxwell's thermodynamic relations are very useful in solving problems in thermodynamics. Each of Maxwell's relations relates a partial differential between quantities that can be hard to measure experimentally to a partial differential between quantities that can be easily measured. These relations are a set of equations derivable from the symmetry of the second derivatives and the thermodynamic potentials.
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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
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James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having combined existing knowledge of the laws of electricity and the laws of magnetism with his insights to form a complete overarching electromagnetic theory, represented by Maxwell's equations. The four basic laws of electricity and magnetism were discovered experimentally through the work of physicists such as Oersted, Coulomb, Gauss, and...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Photonic Maxwell's Demon.

Mihai D Vidrighin1,2, Oscar Dahlsten2,3, Marco Barbieri2,4

  • 1QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom.

Physical Review Letters
|February 20, 2016
PubMed
Summary
This summary is machine-generated.

Researchers experimentally demonstrated Maxwell

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Area of Science:

  • Thermodynamics
  • Quantum Optics
  • Information Theory

Background:

  • Maxwell's demon is a thought experiment exploring the relationship between information and thermodynamics.
  • Extracting work from heat using information has been a long-standing challenge in physics.

Purpose of the Study:

  • To experimentally realize Maxwell's demon in a photonic system.
  • To investigate the link between information acquisition and work extraction.
  • To derive and validate a theoretical bound for work extraction based on measurement information.

Main Methods:

  • Utilized a photonic setup for the experiment.
  • Performed measurements at the few-photons level.
  • Implemented a feed-forward operation based on measurement outcomes.
  • Derived a theoretical equality relating work and information.
  • Established a bound for work extraction.

Main Results:

  • Successfully demonstrated Maxwell's demon in a photonic system.
  • Showed that information acquired through measurement enables work extraction from thermal light.
  • Experimental results align with the derived theoretical bound.
  • Quantified work extracted into an electric circuit.

Conclusions:

  • Photonic systems are a viable platform for exploring information thermodynamics.
  • The experiment validates the connection between information and thermodynamic work.
  • The derived bound provides a theoretical framework for understanding information-driven work extraction.