  Conventional wisdom suggests that realistic quantum repeaters will require
quasi-deterministic sources of entangled photon pairs. In contrast, we here
study a quantum repeater architecture that uses simple parametric
down-conversion sources, as well as frequency-multiplexed multimode quantum
memories and photon-number resolving detectors. We show that this approach can
significantly extend quantum communication distances compared to direct
transmission. This shows that important trade-offs are possible between the
different components of quantum repeater architectures.
