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Entropy02:39

Entropy

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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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Production and Targeting of Monovalent Quantum Dots
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Entanglement in ladder-plus-Y double quantum dot structure via entropy.

Hakeem H Al-Ameri, M Abdullah, Amin Habbeb Al-Khursan

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    This summary is machine-generated.

    Quantum entropy in double quantum dots is influenced by carrier occupations and optical fields. Including a wetting layer and specific momenta calculations provides a more accurate understanding than previous methods.

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    Area of Science:

    • Quantum physics
    • Condensed matter physics
    • Nanotechnology

    Background:

    • Double quantum dot systems are crucial for quantum information processing.
    • Understanding quantum entropy is key to controlling quantum states.
    • Previous studies often simplified system parameters, limiting accuracy.

    Purpose of the Study:

    • To calculate quantum entropy in a ladder-plus-Y double quantum dot system.
    • To investigate the impact of various controlling parameters on quantum entropy.
    • To highlight the importance of including wetting layer and transition-specific momenta.

    Main Methods:

    • Calculation of quantum entropy using system parameters.
    • Analysis of four coherent optical fields, three tunneling components, and incoherent optical pumping.
    • Inclusion of a wetting layer (WL) and transition-specific momenta.

    Main Results:

    • Quantum entropy is dependent on the difference in carrier occupations between the two quantum dots (QDs).
    • A probe optical field decreases entropy, while a pumping field increases it.
    • Removing the main tunneling component eliminates entropy; high wetting layer-quantum dot momentum increases it.

    Conclusions:

    • Accurate quantum entropy calculation requires considering wetting layer and specific momenta.
    • Standard assumptions (uniform momentum) underestimate quantum entropy.
    • The findings offer insights for optimizing quantum dot system design and control.