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Bulletin of the American Physical Society

Circuit-QED-based investigations of two-dimensional Josephson junction arrays in the quantum regime

Hiroki Ikegami, R. Cosmic, Yasunobu Nakamura

Published Mar 15, 2021• 0 citations
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We have investigated two-dimensional arrays of overdamped Josephson junctions that have been fabricated in Nb/Al/sub 2/O/sub 3//Nb-technology, together with microwave coupling structures. Different arrays have shown to emit coherent microwave radiation by using microwave-coupled on-chip detectors. Low-temperature scanning electron microscopy is used to study the coupling of the microwave radiation to an on-chip load. From the appearance of Shapiro steps in the current vs. voltage curves of detector junctions for different degrees of disorder in the array-junctions, margins of the spread in the critical currents of the Josephson junctions for coherent oscillation can be drawn.