Effects of noise-induced coherence on the performance of a four-level laser heat engine

Summary

The study explores the effect of noise-induced coherence on the performance of a four-level laser heat engine, focusing on the universal nature of efficiency.

Highlights

• The presence of noise-induced coherence breaks the left-right symmetry of the system.
• In the high-temperature limit, the symmetry condition is satisfied, and the second universal term η2/8 appears in the series expansion of the efficiency at maximum power.
• In the low-temperature regime, the symmetry condition is also satisfied, leading to the universal nature of efficiency.
• The one-parameter optimization scheme does not result in the second universal term, even with the symmetry condition.
• Imposing an additional symmetric constraint on the control frequencies leads to the emergence of the second universal term.
• The strength of matter-field coupling plays a crucial role in determining the suitable operational regime for the engine to maximize the benefits of noise-induced coherence.

Key Insights

• The noise-induced coherence disrupts the left-right symmetry of the system, affecting the universal nature of efficiency. This highlights the importance of considering the impact of coherence on the system's symmetry.
• The high-temperature limit allows for the satisfaction of the symmetry condition, leading to the appearance of the second universal term. This suggests that the engine's performance can be optimized in this regime.
• The low-temperature regime also satisfies the symmetry condition, resulting in the universal nature of efficiency. This indicates that the engine can operate efficiently in this regime as well.
• The one-parameter optimization scheme's failure to produce the second universal term, even with the symmetry condition, implies that additional constraints are necessary to achieve optimal performance.
• The emergence of the second universal term with the imposition of an additional symmetric constraint on the control frequencies underscores the importance of considering the interplay between symmetry and optimization.
• The strength of matter-field coupling plays a crucial role in determining the suitable operational regime for the engine to maximize the benefits of noise-induced coherence. This highlights the need to carefully consider the coupling strength when designing and operating the engine.
• The results suggest that strong coupling and high-temperature regimes are favorable for engine operation in the presence of noise-induced coherence, as they allow for the optimization of efficiency and power output.

Mindmap

Citation

Kaur, K. (2024). Effects of noise-induced coherence on the performance of a four-level laser heat engine (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2412.18476