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Finite-time performance of a single-ion quantum Otto engine
Suman Chand1, Shubhrangshu Dasgupta1, Asoka Biswas1
1Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India.
Physical Review. E
|April 17, 2021
Summary
This study explores finite-time quantum heat engine performance using a trapped ion. Partial thermalization can boost efficiency due to residual coherence, while rapid strokes reduce it by increasing friction.
Area of Science:
- Quantum thermodynamics
- Statistical mechanics
- Ion trap experiments
Background:
- Quantum heat engines offer a theoretical framework for energy conversion at the nanoscale.
- Understanding finite-time performance is crucial for practical applications.
- Trapped ions provide a controllable platform for studying quantum systems.
Purpose of the Study:
- To investigate the performance of a quantum heat engine based on a single trapped ion operating in finite time.
- To analyze the impact of stroke duration on engine efficiency and explore the role of partial thermalization.
- To elucidate the trade-offs between speed and efficiency in quantum thermodynamic cycles.
Main Methods:
- A quantum heat engine model utilizing a single trapped ion.
- Simulating the engine with an always-on thermal environment as the hot bath.
- Employing the ion's motional degree of freedom as the effective cold bath.
- Implementing isochoric strokes via ion-environment interaction and projective measurements.
- Executing expansion and compression strokes by modulating the applied magnetic field.
Main Results:
- Finite duration of strokes significantly affects quantum heat engine performance.
- Partial thermalization can enhance engine efficiency due to residual coherence.
- Faster expansion and compression strokes lead to increased inner friction, reducing efficiency.
Conclusions:
- The study provides insights into the operational dynamics of finite-time quantum heat engines.
- Residual coherence plays a key role in enhancing efficiency under partial thermalization.
- Optimizing stroke durations is essential for maximizing efficiency and minimizing losses in quantum heat engines.
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