论文标题
调谐没有鱿鱼的约瑟夫森连接阵列的电感
Tuning the inductance of Josephson junction arrays without SQUIDs
论文作者
论文摘要
通常，使用超导量子干扰设备（鱿鱼）来实现磁场可调电感器。在这里，我们在单个Al/Alox/Al Josephson隧道连接的（无鱿鱼）阵列中证明了等效的可调性。通过正确选择结几何形状，垂直施加的磁场沿超导体的平面弯曲，并由于脱氧效应而聚焦于隧道屏障区域。因此，可以通过Fraunhoffer型超电流干扰有效调节约瑟夫森电感。消除鱿鱼不仅简化了设备的设计和制造，而且还促进了连接的密集包装，因此每单位长度更高。例如，我们演示了一条传输线，其波浪阻抗在$ 4-8〜 \ textrm {k}ω$范围内进行了调整，围绕电阻量子的重要值$ h/（2e）^2 \ 6.5〜 \ textrm {k}ω$。
It is customary to use arrays of superconducting quantum interference devices (SQUIDs) for implementing magnetic field-tunable inductors. Here, we demonstrate an equivalent tunability in a (SQUID-free) array of single Al/AlOx/Al Josephson tunnel junctions. With the proper choice of junction geometry, a perpendicularly applied magnetic field bends along the plane of the superconductor and focuses into the tunnel barrier region due to a demagnetization effect. Consequently, the Josephson inductance can be efficiently modulated by the Fraunhoffer-type supercurrent interference. The elimination of SQUIDs not only simplifies the device design and fabrication, but also facilitates a denser packing of junctions and, hence, a higher inductance per unit length. As an example, we demonstrate a transmission line, the wave impedance of which is field-tuned in the range of $4-8~\textrm{k}Ω$, centered around the important value of the resistance quantum $h/(2e)^2 \approx 6.5~\textrm{k}Ω$.
