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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
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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.
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum Interference Effects on Information Phase Space and Entropy Squeezing.

Abdel-Baset A Mohamed1,2, Shoukry S Hassan3, Rania A Alharbey4

  • 1College of Science, Prince Sattam Bin Abdulaziz University, Al-Aflaj 11942, Saudi Arabia.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

Wehrl entropy reveals how quantum interference affects atomic coherence and information loss in phase space. This quantum Zeno effect is influenced by the atom

Keywords:
2-photon transitionWehrl entropyentropy squeezingquantum interferencesqueezed vacuum reservoir

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Information theory

Background:

  • Coherence and information loss are critical in quantum systems.
  • Phase space dynamics offer insights into quantum phenomena.
  • Atomic models coupled to reservoirs are used to study decoherence.

Purpose of the Study:

  • Investigate coherence and information loss dynamics using Wehrl entropy.
  • Analyze the role of quantum interference in a two-photon two-level atomic model.
  • Examine the impact of different radiation reservoirs (NV, TF, SV) on these dynamics.

Main Methods:

  • Utilized Wehrl entropy and its density to analyze phase space dynamics.
  • Studied a two-photon two-level atom coupled to normal vacuum, thermal field, and squeezed vacuum reservoirs.
  • Investigated the influence of quantum interference on atomic inversion decay and information loss.

Main Results:

  • Quantum interference significantly impacts atomic inversion decay, exhibiting quantum Zeno and anti-Zeno effects in the normal vacuum reservoir.
  • Phase space coherence and information loss dynamics are critically affected by quantum interference.
  • Temporal information entropy squeezing was identified and linked to quantum interference.
  • Results demonstrated sensitivity to the initial atomic state.

Conclusions:

  • Wehrl entropy is a valuable tool for understanding quantum decoherence and information dynamics.
  • Quantum interference plays a crucial role in the behavior of atomic systems coupled to reservoirs.
  • The choice of reservoir and initial atomic state significantly influence the observed quantum effects.