Due to their unique properties as lossless, nonlinear circuit elements, Josephson junctions lie at the heart of superconducting quantum information processing. Previously, we demonstrated a two-layer, submicrometer-scale overlap junction fabrication process suitable for qubits with long coherence times. Here, we extend the overlap junction fabrication process to micrometer-scale junctions. This allows us to fabricate other superconducting quantum devices. For example, we demonstrate an overlap-junction-based Josephson parametric amplifier that uses only 2 layers. This efficient fabrication process yields frequency-tunable devices with negligible insertion loss and a gain of ~ 30 dB. Compared to other processes, the overlap junction allows for fabrication with minimal infrastructure, high yield, and state-of-the-art device performance.
@article{arxiv.2005.10908,
title = {Overlap junctions for superconducting quantum electronics and amplifiers},
author = {Mustafa Bal and Junling Long and Ruichen Zhao and Haozhi Wang and Sungoh Park and Corey Rae Harrington McRae and Tongyu Zhao and Russell E. Lake and Daniil Frolov and Roman Pilipenko and Silvia Zorzetti and Alexander Romanenko and David P. Pappas},
journal= {arXiv preprint arXiv:2005.10908},
year = {2021}
}
Comments
5 pages, 4 figures, 1 table. Submitted to Applied Physics Letters. After it is published, it will be found at https://publishing.aip.org/resources/librarians/products/journals/