The ability to non-dissipatively tune the Josephson coupling energy of Josephson junctions is a useful tool in frequency-tunable qubits. This is typically done by threading magnetic flux through two junctions connected in a loop, a geometry that exposes the qubit to magnetic environmental noise. In this paper, we show that by biasing a junction with supercurrent from a separate pair of superconducting leads coupled to the device, the Josephson energy can be tuned without the need for a flux loop. Our multiterminal device may enable the realization of a frequency-tunable qubit with greatly reduced susceptibility to flux noise.
@article{arxiv.2507.14357,
title = {Supercurrent tuning of the Josephson coupling energy},
author = {Maxwell Wisne and Venkat Chandrasekhar},
journal= {arXiv preprint arXiv:2507.14357},
year = {2026}
}