An experimental platform operating at the level of individual quanta and
providing strong light-matter coupling is a key requirement for quantum
information processing. We report on narrowband light storage and retrieval as
well as stationary light, based on electromagnetically induced transparency,
for weak coherent light pulses down to the single-photon level with a
signal-to-noise ratio of 59. The experiments were carried out with laser-cooled
atoms loaded into a hollow-core photonic crystal fiber to provide strong
light-matter coupling, thereby demonstrating the prospects for future quantum
networks of such a platform