非正则量子奥托发动机
Non-Canonical Quantum Otto Engine
- Lanzhou University（兰州大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文研究非正则效应对有限时间量子奥托循环效率和功率统计的影响，发现通过调控复合系统能谱结构，可在量子临界点同时提升平均效率与功率并降低方差，为高效稳定量子能量器件奠定基础。
AI中文摘要：
快速发展的量子技术正将热机——热力学的核心——推向一个新的黄金时代。由于不可忽略的热涨落和量子涨落，有限时间量子热机的效率和功率表现出一种权衡关系，阻碍了高功率与高效率的同时实现。传统研究通过假设正则热化来研究热机的统计特性，而这种假设仅在弱耦合条件下成立。本文研究了非正则效应对有限时间量子奥托循环效率和功率统计特性的影响。研究表明，通过设计由工作物质和热库组成的复合系统的能谱结构，其平均值和方差具有高度可控性。在由能谱中束缚态形成所诱导的量子临界点附近，平均效率和功率可以同时提升，同时两者的方差均减小。我们的结果加深了对量子库工程在热力学中有用性的理解，为实现高效且稳定的量子能量器件奠定了基础。
英文摘要：
The fast-developing quantum technology is propelling thermal machine, which lies at the heart of thermodynamics, into a new golden era. Being stochastic because of the non-negligible thermal and quantum fluctuations, the efficiency and power of a finite-time quantum heat engine exhibit a trade-off, preventing the simultaneous achievement of high power and high efficiency. Conventional studies treat the statistics of a heat engine by assuming canonical thermalization, which is valid only under weak-coupling conditions. We here investigate the noncanonical effect on the statistics of the efficiency and power for a finite-time quantum Otto cycle. It is revealed that their average values and variances are highly controllable by engineering the energy spectrum structure of the composite system consisting of the working substance and the bath. Near the quantum critical point induced by the formation of a bound state in the energy spectrum, the average efficiency and power can be boosted simultaneously, meanwhile, both of their variances are decreased. Deepening our understanding of the usefulness of quantum reservoir engineering in thermodynamics, our result lays the foundation for the realization of efficient and stable quantum energy devices.
