We study the sub-gap spectrum and the transport properties of a double quantum dot coupled to metallic and superconducting leads. The coupling of both quantum dots to the superconducting lead induces a non-local pairing in both quantum dots by the Andreev reflection processes. Additionally, we obtain two channels of Cooper pair tunneling into a superconducting lead. In such a system, the direct tunneling process (by one of two dots) or the crossed tunneling process (by both quantum dots at the same time) is possible. We consider the dependence of the Andreev transmittance on an inter-dot tunneling amplitude and the coupling between a quantum dot and the superconducting lead. We also consider the occurrence of interferometric Fano-type line shapes in the linear Andreev conductance spectra.

我们研究了与金属和超导引线耦合的双量子点的子带谱和传输性质。两个量子点与超导引线的耦合通过安德列夫反射过程在两个量子点中引起了非局部配对。此外，我们获得了库珀对隧穿到超导导线中的两个通道。在这样的系统中，直接隧穿过程（通过两个点之一）或交叉隧穿过程（通过两个量子点同时）是可能的。我们考虑了安德列夫透射率对点间隧穿幅度的依赖以及量子点与超导引线之间的耦合。我们还考虑了线性安德列夫电导谱中干涉法诺型线形的出现。