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Entropy Production in Non-Markovian Collision Models: Information Backflow vs. System-Environment Correlations.

Hüseyin T Şenyaşa1, Şahinde Kesgin2, Göktuğ Karpat3

  • 1Department of Physics, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 34469, Turkey.

Entropy (Basel, Switzerland)
|June 24, 2022
PubMed
Summary
This summary is machine-generated.

We studied quantum systems and found that negative entropy production occurs when system-environment correlations are preserved, not just from non-Markovian dynamics alone.

Keywords:
collision modelsentropy productionopen quantum systems

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Area of Science:

  • Quantum thermodynamics
  • Open quantum systems
  • Statistical mechanics

Background:

  • Investigating irreversible entropy production is crucial for understanding quantum thermodynamics.
  • Non-Markovian dynamics and negative entropy production rates are debated topics in open quantum systems.

Purpose of the Study:

  • To explore the relationship between non-Markovian dynamics and negative entropy production rates in a qubit system.
  • To differentiate the roles of information backflow and system-environment correlations in entropy production.

Main Methods:

  • Utilized microscopic collision models to simulate a qubit interacting with its environment.
  • Employed two distinct collision models: one preserving system-environment correlations and one that does not.
  • Analyzed both Markovian and non-Markovian regimes to observe entropy production dynamics.

Main Results:

  • The collision model preserving system-environment correlations exhibited negative entropy production rates during transient dynamics.
  • The model without preserved correlations maintained positive entropy production rates, despite slower convergence in non-Markovian regimes.
  • Non-Markovianity via information backflow alone does not solely explain negative entropy production.

Conclusions:

  • System-environment correlations are a key mechanism driving negative entropy production rates.
  • Negative entropy production is not solely attributable to non-Markovian effects like information backflow.
  • Preserving correlations is essential for observing negative entropy production in open quantum systems.