  We investigate the systematic use of the Schwinger representation, by virtue
of which two boson fields are equivalent to an effective spin, for casting
multimode squeezed states into multipartite spin entangled states. The
motivation for this endeavor is the following established fact: finitely
squeezed, two-mode entangled states can be recast into maximally entangled
bipartite spin states, irrespective of their level of squeezing (in the
lossless case). This work explores the generalization of this interesting
property to multipartite entanglement. While we found that the generalization
of multipartite Gaussian entanglement to multipartite spin entanglement is not
straightforward, there are nonetheless interesting features and entangled
states to be found. Here we study a few CV entangled states already realized
experimentally, and show that some of them correspond to multipartite spin
entangled states.
