Quantum tomography of mesoscopic superpositions of radiation states

We show the feasibility of a tomographic reconstruction of
``Schroedinger-cat states'' generated according to the scheme proposed
by S. Song, C.M. Caves and B. Yurke [Phys. Rev. A 41, 5261
(1990)]. We present a technique that tolerates realistic values for
quantum efficiency at photodetectors. The measurement can be achieved
by a standard experimental setup.