Abstract
We implement a broadly tunable phase shifter for microwaves based on superconducting quantum interference devices (SQUIDs) and study it both experimentally and theoretically. At different frequencies, a unit transmission coefficient, |S21| = 1, can be theoretically achieved along a curve where the phase shift is controllable by the magnetic flux. The fabricated device consists of three equidistant SQUIDs interrupting a transmission line. We model each SQUID embedded at different positions along the transmission line with two parameters, capacitance and inductance, the values of which we extract from the experiments. In our experiments, the tunability of the phase shift varies from 0.07 × π to 0.14 × π radians along the full-transmission curve with the input frequency ranging from 6.00 GHz to 6.28 GHz. The reported measurements are in good agreement with simulations, which is promising for future design work of phase shifters for different applications.
Original language | English |
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Article number | 065128 |
Journal | AIP Advances |
Volume | 10 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jun 2020 |
MoE publication type | A1 Journal article-refereed |
Funding
This research was financially supported by the European Research Council under Grant No. 681311 (QUESS); by the European Commission through H2020 program project QMiCS (Grant Agreement No. 820505, Quantum Flagship); by the Academy of Finland under its Centers of Excellence Program Grant Nos. 312300, 312059, 308161, 314302, 316551, 318937, and 319579; and by the Alfred Kordelin Foundation, the Emil Aaltonen Foundation, the Vilho, Yrjö, and Kalle Väisälä Foundation, the Jane and Aatos Erkko Foundation, the Technology Industries of Finland Centennial Foundation and Finnish Cultural Foundation.