论文标题
光子热传输从弱耦合到强耦合
Photonic heat transport from weak to strong coupling
论文作者
论文摘要
超导电路为量子热力学实验提供了一个有利的平台。此类实验的重要组成部分是加热阀，即允许人们控制流经系统的热力的设备。在这里，我们从理论上研究了基于两个通过两个谐振器耦合到两个热浴的超导量子干扰装置（Squid）的热阀。该系统中的热电流可以通过磁通量调节。我们研究热电流调制如何取决于鱿鱼和谐振器之间的耦合强度g。在弱耦合方面，热电流调制随着G2的增长而增长，但是令人惊讶的是，在中间耦合下，它可以被强烈抑制。这种效果与弱耦合时热传输的共鸣性有关，其中热电流依赖于磁通量是一组周期性的狭窄峰。在中间耦合时，峰变得更宽，重叠，从而减少了热调节。在非常强的耦合下，热调节再次生长，最后以恒定值饱和。
Superconducting circuits provide a favorable platform for quantum thermodynamic experiments. An important component for such experiments is a heat valve, i.e. a device which allows one to control the heat power flowing through the system. Here we theoretically study the heat valve based on a superconducting quantum interference device (SQUID) coupled to two heat baths via two resonators. The heat current in such system can be tuned by magnetic flux. We investigate how does the heat current modulation depend on the coupling strength g between the SQUID and the resonators. In the weak coupling regime the heat current modulation grows as g2, but, surprisingly, at the intermediate coupling it can be strongly suppressed. This effect is linked to the resonant nature of the heat transport at weak coupling, where the heat current dependence on the magnetic flux is a periodic set of narrow peaks. At the intermediate coupling, the peaks become broader and overlap, thus reducing the heat modulation. At very strong coupling the heat modulation grows again and finally saturates at a constant value.
