  The recent observation of the dynamical Casimir effect in a modulated
superconducting waveguide, coronating thirty years of world-wide research,
empowered the quantum technology community with a powerful tool to create
entangled photons on-chip. In this work we show how, going beyond the single
waveguide paradigm using a scalable array, it is possible to create
multipartite nonclassical states, with the possibility to control the
long-range quantum correlations of the emitted photons. In particular, our
finite-temperature theory shows how maximally entangled $NOON$ states can be
engineered in a realistic setup. The results here presented open the way to new
kinds of quantum fluids of light, arising from modulated vacuum fluctuations in
linear systems.
