  Using tapered fibers of As2Se3 chalcogenide glass, we produce photon pairs at
telecommunication wavelengths with low pump powers. We found maximum
coincidences-to-accidentals ratios of $2.13\pm0.07$ for degenerate pumping with
3.2 {\mu}W average power, and $1.33\pm0.03$ for non-degenerate pumping with 1.0
{\mu}W and 1.5 {\mu}W average power of the two pumps. Our results show that the
ultrahigh nonlinearity in these microwires could allow single-photon pumping to
produce photon pairs, enabling the production of large entangled states,
heralding of single photons after lossy transmission, and photonic quantum
information processing with nonlinear optics.
