A gate voltage can suppress the supercurrent in superconducting nanowires, an effect that has sparked interest in superconductor-based computing. Researchers have now introduced a universal logic circuit built from such gate-controlled switches, operating at liquid-helium temperatures.

The device realises a functionally complete set of logic gates, AND, OR, NOT and COPY, and the design allows all classical logic gates and a half-adder using at most three nanowires, each with two side gates. Its layout and scalability make it a candidate building block for superconducting electronics and hybrid supercomputers. The work comes from the Budapest University of Technology and Economics (groups of Szabolcs Csonka and Péter Makk), with a co-author at Aalto University's Low Temperature Laboratory, and acknowledges QMAT support.

The preprint has not yet been peer reviewed.

Figure: Berke et al., arXiv:2607.00769 (2026), CC BY 4.0