  In this Letter we propose a robust quantum repeater architecture building on
the original DLCZ protocol [L.M. Duan \textit{et al.}, Nature \textbf{414}, 413
(2001)]. The architecture is based on two-photon Hong-Ou-Mandel-type
interference which relaxes the long distance stability requirements by about 7
orders of magnitude, from sub wavelength for the single photon interference
required by DLCZ to the coherence length of the photons. Our proposal provides
an exciting possibility for robust and realistic long distance quantum
communication.
