  Processing and distributing quantum information using photons through
fibre-optic or free-space links is essential for building future quantum
networks. The scalability needed for such networks can be achieved by employing
photonic quantum states that are multiplexed into time and/or frequency, and
light-matter interfaces that are able to store and process such states with
large time-bandwidth product and multimode capacities. Despite important
progress in developing such devices, the demonstration of these capabilities
using non-classical light remains challenging. Employing the atomic frequency
comb quantum memory protocol in a cryogenically cooled erbium-doped optical
fibre, we report the quantum storage of heralded single photons at a
telecom-wavelength (1.53 {\mu}m) with a time-bandwidth product approaching 800.
Furthermore we demonstrate frequency-multimode storage as well as memory-based
spectral-temporal photon manipulation. Notably, our demonstrations rely on
fully integrated quantum technologies operating at telecommunication
wavelengths, i.e. a fibre-pigtailed nonlinear waveguide for the generation of
heralded single photons, an erbium-doped fibre for photon storage and
manipulation, and fibre interfaced superconducting nanowire devices for
efficient single photon detection. With improved storage efficiency, our
light-matter interface may become a useful tool in future quantum networks.
