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  3. Simple Model For Realizing Coherent Ergotropy In Open Quantum Systems.
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  3. Simple Model For Realizing Coherent Ergotropy In Open Quantum Systems.

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Simple model for realizing coherent ergotropy in open quantum systems.

Guo-Hao Xu1, Jiarui Zeng2, Yao Yao1,3

  • 1Department of Physics, South China University of Technology, Guangzhou 510640, China.

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|April 1, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Harnessing quantum coherence in heat engines is challenging due to thermal dissipation. This study shows anisotropic coupling in a two-qubit system preserves quantum coherence, enabling efficient work extraction for quantum heat engines.

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Area of Science:

  • Quantum Thermodynamics
  • Quantum Information Science
  • Statistical Mechanics

Background:

  • Quantum heat engines offer advantages by utilizing quantum resources like coherence.
  • Thermal dissipation in baths suppresses quantum coherence, limiting engine efficiency.
  • Understanding non-Markovian environments is crucial for quantum heat engine performance.

Purpose of the Study:

  • To investigate the role of coupling anisotropy in preserving quantum coherence.
  • To model the coherent contribution of ergotropy in a non-Markovian environment.
  • To demonstrate a pathway for utilizing quantum coherence in heat engines.

Main Methods:

  • Construction of a two-qubit system coupled anisotropically to a thermal bath with a single pseudomode.
  • Analysis of the system's behavior in a non-Markovian regime.
  • Comparison of ergotropy extraction under anisotropic versus isotropic coupling.

    • Main Results:

    • Anisotropic coupling sustains quantum coherence, essential for coherent ergotropy.
    • Incoherent ergotropy dominates with isotropic coupling.
    • Stronger anisotropic couplings lead to greater coherent ergotropy, achievable in both antiferromagnetic and ferromagnetic configurations.
    • The proposed mechanism is scalable to multi-qubit systems.

    Conclusions:

    • Coupling anisotropy is key to preserving quantum coherence for work extraction in quantum heat engines.
    • The model provides a proof-of-principle for utilizing quantum coherence effectively.
    • This research opens avenues for designing more efficient quantum heat engines.