We have produced high-quality complex microwave circuits, such as multiplexed resonators and superconducting phase qubits, using a "vacuum-gap" technology that eliminates lossy dielectric materials. We have improved our design and fabrication strategy beyond our earlier work, leading to increased yield, enabling the realization of these complex circuits. We incorporate both novel vacuum-gap wiring crossovers (VGX) for gradiometric inductors and vacuum-gap capacitors(VGC) on chip to produce resonant circuits that have large internal quality factors (30,000<Q<165,000) at 50 mK, outperforming most dielectric-filled devices. Resonators with VGCs as large as 180 pF confirm single mode behavior of our lumped-element components.
@article{arxiv.0910.5252,
title = {Low-loss superconducting resonant circuits using vacuum-gap-based microwave components},
author = {Katarina Cicak and Dale Li and Joshua A. Strong and Michael S. Allman and Fabio Altomare and Adam J. Sirois and Jed D. Whittaker and John D. Teufel and Raymond W. Simmonds},
journal= {arXiv preprint arXiv:0910.5252},
year = {2010}
}