论文标题
平面约瑟夫森连接阵列的非本地远程同步
Nonlocal long-range synchronization of planar Josephson junction arrays
论文作者
论文摘要
我们研究了平面NB Josephson连接的阵列，并与中间电极接触，这允许测量单个连接，因此提供了对复杂阵列动力学的见解。尽管结间间隔显着，但我们观察到阵列的强大相锁。报道了几种不寻常的现象，例如在切换附近连接时具有重新进入超导性的双稳定临界电流；以及不正确的shapiro步骤，发生在外部RF辐射和附近连接处的约瑟夫森频率之间的混合频率上。我们的结果显示出令人惊讶的强大和远程结间相互作用。它归因于平面连接电动力学的非局部性，这是由于杂种电磁场的长距离扩散引起的。非局部性大大增强了高频互连接的耦合，并实现了大规模同步。因此，我们得出的结论是，平面几何形状对于实现相干的约瑟夫森电子是有利的。
We study arrays of planar Nb Josephson junctions with contacts to intermediate electrodes, which allow measurements of individual junctions and, thus, provide an insight into intricate array dynamics. We observe a robust phase-locking of arrays, despite a significant inter-junction separation. Several unusual phenomena are reported, such as a bi-stable critical current with re-entrant superconductivity upon switching of nearby junctions; and incorrect Shapiro steps, occurring at mixing frequencies between the external RF radiation and the internal Josephson frequency in nearby junctions. Our results reveal a surprisingly strong and long-range inter-junction interaction. It is attributed to nonlocality of planar junction electrodynamics, caused by the long-range spreading of stray electromagnetic fields. The nonlocality greatly enhances the high-frequency interjunction coupling and enables large-scale synchronization. Therefore, we conclude that planar geometry is advantageous for realization of coherent Josephson electronics.
