  We present a scheme to realize versatile quantum networks by cascading
several four-wave mixing (FWM) processes in warm rubidium vapors. FWM is an
efficient $\chi^{(3)}$ nonlinear process, already used as a resource for
multimode quantum state generation and which has been proved to be a promising
candidate for applications to quantum information processing. We analyze
theoretically the multimode output of cascaded FWM systems, derive its
independent squeezed modes and show how, with phase controlled homodyne
detection and digital post-processing, they can be turned into a versatile
source of continuous variable cluster states.
