  We report an observation of a new, non dissipative and non local
supercurrent, carried by quartets; each consisting of four entangled electrons.
The supercurrent is a result of a novel Andreev bound state (ABS), formed among
three superconducting terminals. While in a two-terminal Josephson junction the
usual ABS, and thus the DC Josephson current, exist only in equilibrium, in the
present realization the ABS exists also in the strongly nonlinear regime
(biased terminals). The presence of supercurrent carried by quartets was
established by performing non-local conductance and cross-correlation of
current fluctuations measurements, in different devices made of aluminum-InAs
nanowire junctions. An extensive and detailed theoretical study is intertwined
with the experimental results.
