Rasola Miika, Möttönen Mikko
QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, 00076, Aalto, Finland.
QTF Centre of Excellence, VTT Technical Research Centre of Finland Ltd., P.O. Box 1000, 02044 VTT, Espoo, Finland.
Sci Rep. 2024 Apr 24;14(1):9448. doi: 10.1038/s41598-024-59881-z.
We propose a recipe for demonstrating an autonomous quantum heat engine where the working fluid consists of a harmonic oscillator, the frequency of which is tuned by a driving mode. The working fluid is coupled two heat reservoirs each exhibiting a peaked power spectrum, a hot reservoir peaked at a higher frequency than the cold reservoir. Provided that the driving mode is initialized in a coherent state with a high enough amplitude and the parameters of the utilized optomechanical Hamiltonian and the reservoirs are appropriate, the driving mode induces an approximate Otto cycle for the working fluid and consequently its oscillation amplitude begins to increase in time. We build both an analytical and a non-Markovian quasiclassical model for this quantum heat engine and show that reasonably powerful coherent fields can be generated as the output of the quantum heat engine. This general theoretical proposal heralds the in-depth studies of quantum heat engines in the non-Markovian regime. Further, it paves the way for specific physical realizations, such as those in optomechanical systems, and for the subsequent experimental realization of an autonomous quantum heat engine.
我们提出了一种用于演示自主量子热机的方案，其中工作介质由一个谐振子组成，其频率由一个驱动模式进行调谐。该工作介质与两个热库耦合，每个热库都呈现出一个峰值功率谱，热库的峰值频率高于冷库。只要驱动模式以足够高的振幅初始化为相干态，并且所使用的光机械哈密顿量和热库的参数合适，驱动模式就会为工作介质诱导出一个近似的奥托循环，结果其振荡幅度开始随时间增加。我们为这个量子热机建立了一个解析的和一个非马尔可夫准经典模型，并表明可以产生相当强大的相干场作为量子热机的输出。这一通用的理论方案预示着对非马尔可夫 regime 下量子热机的深入研究。此外，它为具体的物理实现（如光机械系统中的实现）以及随后自主量子热机的实验实现铺平了道路。
