Supercurrent tuning of the Josephson coupling energy
Phys. Rev. B 113, 054518 – Published 20 February, 2026
DOI: https://doi.org/10.1103/pc88-8kp6
Abstract
The ability to nondissipatively 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.
