  A fundamental prerequisite for the implementation of linear optical quantum
computation is a source of single-photon wavepackets capable of high-visibility
interference in scalable networks. These conditions can be met with
micro-structured waveguides in conjunction with ultra-short classical timing
pulses. By exploiting a novel type-II phasematching configuration we
demonstrate a waveguided single photon source exhibiting a conditional
detection efficiency exceeding 51% (which corresponds to a preparation
efficiency of 85%) and extraordinarily high detection rates of up to 8.5x10^5
coincidences/[s.mW].
