Gate-tuneable superconducting electronics

In the last few years, a series of experiments from a research group in Pisa have shown that superconductivity in a weak link can be controlled by applying voltages to electrostatic gates, in a similar way as semiconducting transistors are controlled by the field effect. This discovery has the potential to revolutionize the world of supercomputing, leading to a technology that combines the advantages offered by semiconductors and superconductors. However, the underlying physical mechanism behind it is still unclear. In addition, the control has been demonstrated only at low frequencies (dc and audio band), while the prospected applications require switching at much higher frequencies (GHz and above). At 202Q-lab we plan to investigate gate-tuneable superconducting weak links at microwave frequencies, gaining insight on their physics, validating their performance in the GHz band, and paving the way for further applications. This research is funded by the Horizon 2020 FET Open project SuperGate, starting March 1 2021.
Related publications
Dynamics of Gate-Controlled Superconducting Dayem Bridges
François Joint, Kazi Rafsanjani Amin, Ivo Cools, Simone Gasparinetti
arXiv:2405.07377 (2024)
Effects of fabrication routes and material parameters on the control of superconducting currents by gate voltage
Ludwig Ruf, Tosson Elalaily, Claudio Puglia, Yurii P. Ivanov, Francois Joint, Martin Berke, Andrea Iorio, Peter Makk, Giorgio De Simoni, Simone Gasparinetti, Giorgio Divitini, Szabolcs Csonka, Francesco Giazotto, Elke Scheer, Angelo Di Bernardo
APL Materials 11, 091113 (2023)
Gate control of superconducting current: Mechanisms, parameters, and technological potential
Leon Ruf, Claudio Puglia, Tosson Elalaily, Giorgio De Simoni, Francois Joint, Martin Berke, Jennifer Koch, Andrea Iorio, Sara Khorshidian, Peter Makk, Simone Gasparinetti, Szabolcs Csonka, Wolfgang Belzig, Mario Cuoco, Francesco Giazotto, Elke Scheer, Angelo Di Bernardo
Applied Physics Reviews 11, 041314 (2024)