Recent theoretical and experimental studies in quantum heat engines show that, in the quasi-static regime, it is possible to have higher efficiency than the limit imposed by Carnot, provided that engineered reservoirs are used. The quasi-static regime, however, is a strong limitation to the operation of heat engines, since an infinitely long time is required to complete a cycle. In this paper we propose a two-level model as the working substance to perform a quantum Otto heat engine surrounded by a cold thermal reservoir and a squeezed hot thermal reservoir. Taking advantage of this model we show a striking achievement, that is to attain unity efficiency even at non-null power.

最近关于量子热机的理论和实验研究表明，在准静态状态下，只要使用工程储层，就有可能具有比卡诺强加的限制更高的效率。然而，准静态状态对热机的运行是一个很大的限制，因为完成一个循环需要无限长的时间。在本文中，我们提出了一个两能级模型作为工作物质，以执行由冷热库和挤压热库包围的量子奥托热机。利用这个模型，我们展示了一个惊人的成就，即即使在非零功率下也能达到统一效率。