量子エンジンと量子冷蔵庫は機能が異なるだけでなく、同期動作も対照的である。 Quantum engines and refrigerators not only have differing functions, but they also prefer contrasting synchronization behavior
2023-07-18 韓国基礎科学研究院(IBS)
◆この研究は、同期と熱力学の基本的な関係を明らかにするだけでなく、量子技術の設計や量子デバイスの性能と同期の関係に新たなアイデアを提供する重要な成果です。今後、より効率的で強力な量子マシンの開発につながる可能性があります。
＜関連情報＞
- https://www.ibs.re.kr/cop/bbs/BBSMSTR_000000000738/selectBoardArticle.do
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.030401
- https://journals.aps.org/pra/abstract/10.1103/PhysRevA.108.012205
同期的な開放量子系における協力と競争 Cooperation and Competition in Synchronous Open Quantum Systems
Taufiq Murtadho, Sai Vinjanampathy, and Juzar Thingna
Physical Review Letters Published 17 July 2023
DOI:https://doi.org/10.1103/PhysRevLett.131.030401
ABSTRACT
Synchronization between limit cycle oscillators can arise through entrainment to an external drive or through mutual coupling. The interplay between the two mechanisms has been studied in classical synchronizing systems, but not in quantum systems. Here, we point out that competition and cooperation between the two mechanisms can occur due to phase pulling and phase repulsion in quantum systems. We study their interplay in collectively driven degenerate quantum thermal machines and show that these mechanisms either cooperate or compete depending on the working mode of the machine (refrigerator or engine). The entrainment-mutual synchronization interplay persists with an increase in the number of degenerate levels, while in the thermodynamic limit of degeneracy, mutual synchronization dominates. Overall, our work investigates the effect of degeneracy and multilevel scaling of quantum synchronization and shows how different synchronizing mechanisms can cooperate and compete in quantum systems.
量子熱機械の同期による効率の下界を導く Deriving lower bounds on the efficiency of near-degenerate thermal machines via synchronization
Taufiq Murtadho, Juzar Thingna, and Sai Vinjanampathy
Physical Review A Published 17 July 2023
DOI:https://doi.org/10.1103/PhysRevA.108.012205
ABSTRACT
We study the relationship between quantum synchronization and the thermodynamic performance of a four-level near-degenerate extension of the Scovil–Schulz-DuBois thermal maser. We show how the existence of interacting coherences can potentially modify the relationship between synchronization and the coherent power output of such a maser. In particular, the cooperation and competition between interacting coherences cause the coherent heat and efficiency to be bounded by the synchronization measure in addition to the well-studied power synchronization bound. Overall, our results highlight the role of quantum synchronization in the working of a thermal machine.
