  Using the quantum teleportation in continuous variables as a test scheme, we
compare two entangled transformations - mixing of signals on a beamsplitter and
by the CZ operation. We evaluate these transformations in terms of the errors
added to teleported oscillators. We have shown that the CZ operation leads to
the lower error of teleportation. This error can be further reduced by choosing
appropriate weight coefficients for the CZ transforms. We have compared the
errors of the theoretical CZ scheme and its practical implementation in the
optical design. Although the CZ optical scheme adds intrinsic noise to the
overall transformation, it is nevertheless possible to specify the parameters
which provides a gain in comparison with the traditional teleportation
protocol.
