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Potential energy or potential function plays an essential role in determining the stability of a mechanical system. If a system is subjected to both gravitational and elastic forces, the potential function of the system can be expressed as the algebraic sum of gravitational and elastic potential energy. If the system is in equilibrium and is displaced by a small amount, then the work done on the system equals the negative of the change in the system's potential energy from the initial to...
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Quantum Energy Lines and the Optimal Output Ergotropy Problem.

Salvatore Tirone1, Raffaele Salvia1, Vittorio Giovannetti2

  • 1Scuola Normale Superiore, I-56127 Pisa, Italy.

Physical Review Letters
|December 3, 2021
PubMed
Summary
This summary is machine-generated.

We investigated transferring useful energy along quantum transmission lines. Coherent inputs optimally preserve quantum coherence and maximize energy transfer for specific models.

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Area of Science:

  • Quantum thermodynamics
  • Quantum information theory
  • Energy transfer in quantum systems

Background:

  • Understanding energy transfer in quantum systems is crucial for quantum technologies.
  • Quantum coherence plays a vital role in efficient energy transfer.
  • Ergotropy and nonequilibrium free energy are key metrics for useful energy extraction.

Purpose of the Study:

  • To determine optimal input states for maximizing useful energy transfer along quantum transmission lines.
  • To analyze the role of quantum coherence preservation in energy transfer efficiency.
  • To investigate energy transfer metrics like ergotropy and nonequilibrium free energy.

Main Methods:

  • Modeling quantum transmission lines as bosonic Gaussian channels (BGCs).
  • Analyzing phase-invariant and non-phase-invariant BGC models.
  • Optimizing input signals to maximize output ergotropy and nonequilibrium free energy under an energy threshold.

Main Results:

  • Coherent inputs were found to be optimal for phase-invariant BGCs.
  • The optimization problem was solved for non-phase-invariant BGCs with Gaussian input signals.
  • Maximum achievable values for ergotropy, total ergotropy, and nonequilibrium free energy were determined.

Conclusions:

  • Coherent states are highly effective for preserving quantum coherence and maximizing useful energy transfer.
  • The findings provide insights into designing efficient quantum energy transfer protocols.
  • This study contributes to the theoretical understanding of quantum thermodynamics in open quantum systems.