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Quantum Otto engine working with interacting spin systems: Finite power performance in stochastic thermodynamics
Yingying Hong1, Yuling Xiao1, Jizhou He1
1Department of Physics, Nanchang University, Nanchang 330031, China.
Physical Review. E
|September 18, 2020
Summary
This study analyzes a quantum Otto engine with two interacting spins. Interparticle interactions significantly affect engine efficiency and power fluctuations, but become irrelevant at maximal power.
Area of Science:
- Quantum thermodynamics
- Statistical mechanics
- Quantum computing
Background:
- Quantum Otto engines are theoretical devices that operate based on quantum mechanical principles.
- Understanding the role of interactions in quantum engines is crucial for their development.
- Stochastic thermodynamics provides a framework for analyzing fluctuations in small systems.
Purpose of the Study:
- To analyze a quantum Otto engine with two interacting spins as the working medium.
- To investigate the impact of interparticle interactions on engine efficiency and power fluctuations.
- To determine the conditions under which these effects become independent of interactions.
Main Methods:
- Utilizing the framework of stochastic thermodynamics.
- Explicitly deriving time-dependent power fluctuations and average power for a complete engine cycle.
- Analyzing the optimal control parameter for maximizing engine power.
Main Results:
- Interparticle interactions significantly influence engine efficiency and power fluctuations.
- Both efficiency and power fluctuations become independent of interactions when the engine operates at maximal power.
- The behavior of efficiency at maximum power is explained by analyzing the optimal operational protocol.
Conclusions:
- Interparticle interactions play a critical role in the performance of quantum Otto engines.
- Maximizing engine power offers a pathway to mitigate the effects of interactions on efficiency and fluctuations.
- Optimal control protocols are key to understanding and optimizing quantum engine performance.
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