  An experiment that involves two distant mesoscopic SQUID rings is studied.
The superconducting rings are irradiated with correlated photons, which are
produced by a single microwave source. Classically correlated (separable) and
quantum mechanically correlated (entangled) microwaves are considered, and
their effect on the Josephson currents is quantified. It is shown that the
currents tunnelling through the Josephson junctions in the distant rings, are
correlated.
