  In an abstract sense, quantum data hiding is the manifestation of the fact
that two classes of quantum measurements can perform very differently in the
task of binary quantum state discrimination. We investigate this phenomenon in
the context of continuous variable quantum systems. First, we look at the
celebrated case of data hiding 'against' the set of local operations and
classical communication. While previous studies have placed upper bounds on its
maximum efficiency in terms of the local dimension and are thus not applicable
to continuous variable systems, we tackle this latter case by establishing more
general bounds that rely solely on the local mean photon number of the states
employed. Along the way, we perform a quantitative analysis of the error
introduced by the non-ideal Braunstein--Kimble quantum teleportation protocol,
determining how much two-mode squeezing and local detection efficiency is
needed in order to teleport an arbitrary local state of known mean energy with
a prescribed accuracy. Finally, following a seminal proposal by Winter, we look
at data hiding against the set of Gaussian operations and classical
computation, providing the first example of a relatively simple scheme that
works with a single mode only. The states employed can be generated from a
two-mode squeezed vacuum by local photon counting; the larger the squeezing,
the higher the efficiency of the scheme.
