Raw data for: Supercurrent tuning of the Josephson coupling energy

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.