  We consider transfer of a highly nonclassical quantum state through an
optomechanical system. That is we investigate a protocol consisting of
sequential upload, storage and reading out of the quantum state from a
mechanical mode of an optomechanical system. We show that provided the input
state is in a test-bed single-photon Fock state, the Wigner function of the
recovered state can have negative values at the origin, which is a manifest of
nonclassicality of the quantum state of the macroscopic mechanical mode and the
overall transfer protocol itself. Moreover, we prove that the recovered state
is quantum non-Gaussian for wide range of setup parameters. We verify that
current electromechanical and optomechanical experiments can test this complete
transfer of single photon.
