  An efficient, scalable source of shaped single photons that can be directly
integrated with optical fiber networks and quantum memories is at the heart of
many protocols in quantum information science. We demonstrate a deterministic
source of arbitrarily temporally shaped single-photon pulses with high
efficiency (detection efficiency = 14.9%) and purity ($g^{(2)}(0) = 0.0168$)
and streams of up to 11 consecutively detected single photons using a
silicon-vacancy center in a highly directional fiber-integrated diamond
nanophotonic cavity. Combined with previously demonstrated spin-photon
entangling gates, this system enables on-demand generation of streams of
correlated photons such as cluster states and could be used as a resource for
robust transmission and processing of quantum information.
