Institute of Molecular Physics, Polish Academy of Sciences, ul. M. Smoluchowskiego 17, 60-179 Poznań, Poland.
Phys Rev E. 2018 Jan;97(1-1):012116. doi: 10.1103/PhysRevE.97.012116.
I study an autonomous quantum Maxwell's demon based on two exchange-coupled quantum dots attached to the spin-polarized leads. The principle of operation of the demon is based on the coherent oscillations between the spin states of the system which act as a quantum iSWAP gate. Due to the operation of the iSWAP gate, one of the dots acts as a feedback controller which blocks the transport with the bias in the other dot, thus inducing the electron pumping against the bias; this leads to the locally negative entropy production. Operation of the demon is associated with the information transfer between the dots, which is studied quantitatively by mapping the analyzed setup onto the thermodynamically equivalent auxiliary system. The calculated entropy production in a single subsystem and information flow between the subsystems are shown to obey a local form of the second law of thermodynamics, similar to the one previously derived for classical bipartite systems.
我研究了一种基于两个交换耦合量子点的自主量子麦克斯韦妖，该量子点连接到自旋极化的引线。该妖的工作原理基于系统自旋态之间的相干振荡，其充当量子 iSWAP 门。由于 iSWAP 门的操作，其中一个点充当反馈控制器，该控制器阻止另一个点中的偏置的传输，从而导致电子在偏置的情况下泵送；这导致局部负熵产生。妖的操作与点之间的信息传输有关，通过将分析的设置映射到热力学等效的辅助系统上，可以对其进行定量研究。所计算的单个子系统中的熵产生和子系统之间的信息流被证明遵守热力学第二定律的局部形式，类似于以前为经典双体系统推导的形式。
