论文标题
使用高阻力超导谐振器的GE/Si Core/shell纳米纳线量子点的电荷感密度
Charge-sensing of a Ge/Si core/shell nanowire double quantum dot using a high-impedance superconducting resonator
论文作者
论文摘要
锗中的旋转量表是可扩展量子计算机的有前途的竞争者。通常通过通过纳米线测量电流来执行在GE/Si Core/shell纳米线中形成的量子点的自旋和电荷配置。在这里，我们在研究这些量子点的电荷构型方面展示了一种更通用的方法。我们采用基于NBTIN的高阻抗，磁场弹性超导谐振器，并将其与GE/Si Nanowire中的双量子点息息。这使我们能够分散检测充电效果，即使在纳米线完全捏合并且没有直流电流的状态下，也可以。此外，通过增加远远超出纳米线的电势，我们可以通过使用第二个量子点作为电荷传感器来观察到量子点中的最后一个孔的指示。这项工作为该系统中的分散读数和未来的旋转光子耦合打开了大门。
Spin qubits in germanium are a promising contender for scalable quantum computers. Reading out of the spin and charge configuration of quantum dots formed in Ge/Si core/shell nanowires is typically performed by measuring the current through the nanowire. Here, we demonstrate a more versatile approach on investigating the charge configuration of these quantum dots. We employ a high-impedance, magnetic-field resilient superconducting resonator based on NbTiN and couple it to a double quantum dot in a Ge/Si nanowire. This allows us to dispersively detect charging effects, even in the regime where the nanowire is fully pinched off and no direct current is present. Furthermore, by increasing the electro-chemical potential far beyond the nanowire pinch-off, we observe indications for depleting the last hole in the quantum dot by using the second quantum dot as a charge sensor. This work opens the door for dispersive readout and future spin-photon coupling in this system.
