  We quantify the maximum amount of entanglement of formation (EoF) that can be
achieved by continuous-variable states under passive operations, which we refer
to as EoF-potential. Focusing, in particular, on two-mode Gaussian states we
derive analytical expressions for the EoF-potential for specific classes of
states. For more general states, we demonstrate that this quantity can be
upper-bounded by the minimum amount of squeezing needed to synthesize the
Gaussian modes, a quantity called squeezing of formation. Our work, thus,
provides a new link between non-classicality of quantum states and the
non-classicality of correlations.
