Yu Wen-Li, Li Tao, Li Hai, Zhang Yun, Zou Jian, Wang Ying-Dan
School of Computer Science and Technology, Shandong Technology and Business University, Yantai 264000, China.
School of Information and Electronic Engineering, Shandong Technology and Business University, Yantai 264000, China.
Entropy (Basel). 2021 Sep 8;23(9):1183. doi: 10.3390/e23091183.
We study a scheme of thermal management where a three-qubit system assisted with a coherent auxiliary bath (CAB) is employed to implement heat management on a target thermal bath (TTB). We consider the CAB/TTB being ensemble of coherent/thermal two-level atoms (TLAs), and within the framework of collision model investigate the characteristics of steady heat current (also called target heat current (THC)) between the system and the TTB. It demonstrates that with the help of the quantum coherence of ancillae the magnitude and direction of heat current can be controlled only by adjusting the coupling strength of system-CAB. Meanwhile, we also show that the influences of quantum coherence of ancillae on the heat current strongly depend on the coupling strength of system-CAB, and the THC becomes positively/negatively correlated with the coherence magnitude of ancillae when the coupling strength below/over some critical value. Besides, the system with the CAB could serve as a multifunctional device integrating the thermal functions of heat amplifier, suppressor, switcher and refrigerator, while with thermal auxiliary bath it can only work as a thermal suppressor. Our work provides a new perspective for the design of multifunctional thermal device utilizing the resource of quantum coherence from the CAB.
我们研究了一种热管理方案，其中采用一个由相干辅助浴（CAB）辅助的三量子比特系统对目标热浴（TTB）进行热管理。我们将CAB/TTB视为相干/热二能级原子（TLA）的系综，并在碰撞模型框架内研究系统与TTB之间的稳态热流（也称为目标热流（THC））特性。结果表明，借助辅助量子比特的量子相干性，仅通过调节系统 - CAB的耦合强度就可以控制热流的大小和方向。同时，我们还表明，辅助量子比特的量子相干性对热流的影响强烈依赖于系统 - CAB的耦合强度，当耦合强度低于/高于某个临界值时，THC与辅助量子比特的相干幅度呈正/负相关。此外，具有CAB的系统可以作为一种多功能设备，集成热放大器、抑制器、切换器和制冷机的热功能，而具有热辅助浴时它只能作为热抑制器工作。我们的工作为利用CAB的量子相干资源设计多功能热设备提供了新的视角。
