  Multiphoton interference effects can be measured with a single detector when
two input photons are temporally well separated when compared with the dead
time of the single-photon avalanche detector. Here we experimentally
demonstrate that the Hong-Ou-Mandel interference effect can be observed with a
single non-photon-number resolving detector via a time-delayed coincidence
measurement of successive electrical signals from the detector. The two-photon
interference experiment is performed by utilizing temporally well-separated
pairwise weak coherent pulses and the interference fringes are successfully
measured with a high visibility in the range of the limited upper bound for the
weak coherent photon source.
