Zero-crossing Shapiro step generated in a niobium in-line Josephson gate

IEICE Electronics Express

Yoshinao Mizugaki¹  Hiroshi Shimada¹  Haruna Takahashi¹ 

[1] Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications (UEC Tokyo)

关键词: Josephson effects;    Shapiro step;    superconductor;    microwave;    integrated circuits;   

DOI  :  10.1587/elex.11.20140054

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(13)We demonstrate a zero-crossing Shapiro step generated in a magnetically-coupled Josephson gate, where a long Josephson junction and a control line are placed in-line. The operation is based on the imbalanced evolution of the junction phases owing to the different amplitudes of the positive and negative critical current. A test circuit was fabricated using a Nb/AlOx/Nb junction technology. When we applied a rf signal of 15.2GHz, we observed a Shapiro step that crossed the zero-current axis at the voltage position of the 1st order. The experimental results were quantitatively reproduced by simulation.

【 授权许可】

Unknown