We report on the fabrication and characterization of a two-terminal mesoscopic interferometer based on three V/Cu/V Josephson junctions having nanoscale cross-section. The junctions have been arranged in a double-ring geometry realized by metallic thin film deposition through a suspended mask defined by electron beam lithography. Although a significant amount of asymmetry between the critical current of each junction is observed we show that the interferometer is able to suppress the supercurrent to a level lower than 6 parts per thousand, being here limited by measurement resolution. The present nano-device is suitable for low-temperature magnetometric and gradiometric measurements over the micrometric scale.
@article{arxiv.1312.2847,
title = {Balanced double-loop mesoscopic interferometer based on Josephson proximity nanojunctions},
author = {Alberto Ronzani and Carles Altimiras and Francesco Giazotto},
journal= {arXiv preprint arXiv:1312.2847},
year = {2014}
}