  We generate pulsed, two mode squeezed states in a single spatio-temporal mode
with mean photon numbers up to 20. We directly measure
photon-number-correlations between the two modes with transition edge sensors
up to 80 photons per mode. This corresponds roughly to a state-dimensionality
of 6400. We achieve detection efficiencies of 64% in the technologically
crucial telecom regime and demonstrate the high quality of our measurements by
heralded nonclassical distributions up to 50 photons per pulse and calculated
correlation functions up to 40th order.
