论文标题
在重复互动框架中连续监控的双量子点热发动机的热力学
Thermodynamics of a continuously monitored double quantum dot heat engine in the repeated interactions framework
论文作者
论文摘要
了解测量在量子机械系统中的热力学作用是一个新兴的研究领域。在本文中，我们研究了连接到两个宏观费米子热储层的双量子点（DQD）。我们假设DQD通过量子点触点（QPC）连续监测，该接触是电荷检测器。从QPC和储层的极简主义微观模型开始，我们表明，DQD的本地主方程可以在重复交互的框架中得出，并且该框架可以保证对DQD及其环境的热力学一致描述（包括QPC）。我们分析了测量强度的效果，并确定了一个制度，在该方案中，通过dephasing可以协助和稳定颗粒通过DQD的效果。我们还发现，在这种状态下，通过DQD驱动具有固定相对波动的粒子电流的熵成本。因此，我们得出的结论是，在连续测量下，可以以固定的熵成本来实现更恒定的粒子电流。
Understanding the thermodynamic role of measurement in quantum mechanical systems is a burgeoning field of study. In this article, we study a double quantum dot (DQD) connected to two macroscopic fermionic thermal reservoirs. We assume that the DQD is continuously monitored by a quantum point contact (QPC), which serves as a charge detector. Starting from a minimalist microscopic model for the QPC and reservoirs, we show that the local master equation of the DQD can alternatively be derived in the framework of repeated interactions and that this framework guarantees a thermodynamically consistent description of the DQD and its environment (including the QPC). We analyze the effect of the measurement strength and identify a regime in which particle transport through the DQD is both assisted and stabilized by dephasing. We also find that in this regime the entropic cost of driving the particle current with fixed relative fluctuations through the DQD is reduced. We thus conclude that under continuous measurement a more constant particle current may be achieved at a fixed entropic cost.
