We develop a compact four-port superconducting switch with a tunable operating frequency in the range of 4.8 GHz -- 7.3 GHz. Isolation between channel exceeds 20~dB over a bandwidth of several hundred megahertz, exceeding 40 dB at some frequencies. The footprint of the device is 80×420μm. The tunability requires only a global flux bias without either permanent magnets or micro-electromechanical structures. As the switch is superconducting, the heat dissipation during operation is negligible. The device can operate at up to -80~dBm, which is equal to 2.5×106 photons at 6 GHz per microsecond. The device show a possibility to be operated as a beamsplitter with tunable splitting ratio.
@article{arxiv.2402.19394,
title = {Tunable compact on-chip superconducting switch},
author = {Julia Zotova and Alexander Semenov and Rui Wang and Yu Zhou and Oleg Astafiev and Jaw-Shen Tsai},
journal= {arXiv preprint arXiv:2402.19394},
year = {2024}
}