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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Exchange fluctuation theorem for correlated quantum systems.

Sania Jevtic1, Terry Rudolph2, David Jennings2

  • 1Institut für Theoretische Physik, Appelstr. 2, Hannover, D-30167, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 14, 2015
PubMed
Summary
This summary is machine-generated.

We developed a new fluctuation theorem for energy exchange in quantum systems, accounting for correlations. This theorem reveals how correlations impact equilibration and work extraction in quantum thermodynamics.

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Area of Science:

  • Quantum thermodynamics
  • Statistical mechanics
  • Quantum information theory

Background:

  • The exchange fluctuation theorem governs energy transfer between thermal quantum systems.
  • Previous models often assumed molecular chaos, limiting applicability to highly correlated states.

Purpose of the Study:

  • Extend the exchange fluctuation theorem beyond the molecular chaos assumption.
  • Describe non-equilibrium energy exchange dynamics in correlated quantum states.
  • Investigate the impact of correlations and measurement disturbance on quantum systems.

Main Methods:

  • Theoretical extension of the exchange fluctuation theorem.
  • Development of a "correlation fluctuation theorem" using an abstract approach.
  • Analysis of measurement disturbance effects.
  • Application to semiclassical maximum work theorem and qubit-qudit heat exchange.

Main Results:

  • Quantified how system equilibration is modified by high-correlation environments.
  • Elucidated the role of measurement disturbance in correlated quantum scenarios.
  • Derived a semiclassical maximum work theorem in the presence of correlations.
  • Demonstrated non-classical behaviors like deterministic energy transfer and anomalous heat flow in qubit-qudit heat exchange.

Conclusions:

  • The extended fluctuation theorem accurately describes energy exchange in correlated quantum systems.
  • Correlations significantly alter thermodynamic properties and equilibration tendencies.
  • The framework provides insights into quantum measurement effects and non-classical heat transfer phenomena.