IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Zero-crossing Shapiro step generated in a niobium in-line Josephson gate
Yoshinao MizugakiHaruna TakahashiHiroshi Shimada
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2014 Volume 11 Issue 6 Pages 20140054

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Abstract

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.

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© 2014 by The Institute of Electronics, Information and Communication Engineers
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