  Hybrid semiconductor/superconductor devices constitute an important platform
for a wide range of applications, from quantum computing to
topological-state-based architectures. Here, we demonstrate full modulation of
the interference pattern in a superconducting interference device with two
parallel islands of ballistic InAs quantum wells separated by a trench, by
acting independently on two side-gates. This so far unexplored geometry enables
us to tune the device with high precision from a SQUID-like to a
Fraunhofer-like behavior simply by electrostatic gating, without the need for
an additional in-plane magnetic field. These measurements are successfully
analyzed within a theoretical model of an extended tunnel Josephson junction,
taking into account the focusing factor of the setup. The impact of these
results on the design of novel devices is discussed.
