  Phase-tunable hybrid devices, built upon nanostructures combining normal
metal and superconductors, have been the subject of intense studies due to
their numerous combinations of different charge and heat transport
configurations. They exhibit solid applications in quantum metrology and
coherent caloritronics. Here we propose and realize a new kind of hybrid device
with potential application in single charge manipulation and quantized current
generation. We show that by tuning superconductivity on two proximized
nanowires, coupled via a Coulombic normal metal island, we are able to control
its charge state configuration. This device supports a
one-control-parameter-cycle being actuated by the sole magnetic flux. In a
voltage biased regime, the phase-tunable superconducting gaps can act as energy
barriers for charge quanta leading to an additional degree of freedom in single
electronics. The resulting configuration is fully electrostatic and the current
across the device is governed by the quasiparticle populations in the source
and drain leads. Notably, the proposed device can be realized using standard
nanotechniques opening the possibility to a straightforward coupling with the
nowadays well developed superconducting electronics.
