  We study the experimental realisation of quantum teleportation as performed
by Bouwmeester {\em et al}. [Nature {\bf 390}, 575 (1997)] and the adjustments
to it suggested by Braunstein and Kimble [Nature {\bf 394}, 841 (1998)]. These
suggestions include the employment of a detector cascade and a relative
slow-down of one of the two down-converters. We show that coincidences between
photon-pairs from parametric down-conversion automatically probe the
non-Poissonian structure of these sources. Furthermore, we find that detector
cascading is of limited use, and that modifying the relative strengths of the
down-conversion efficiencies will increase the time of the experiment to the
order of weeks. Our analysis therefore points to the benefits of single-photon
detectors in non-post-selected type experiments, a technology currently
requiring roughly $6^{\circ}$K operating conditions.
