High fidelity distribution of entanglement on metropolitan fibres using warm atomic vapors

The efficient distribution of entanglement over quantum channels is necessary for long distance quantum networks. Here, we present a high spectral brightness source of bichromatic, polarization entangled photons, based on spontaneous four-wave-mixing in a warm rubidium vapor. The source produces pairs with one of the photons in the telecom O-band and the other at 795-nm. Furthermore, we report on experiments performed with the source using dark fibers in New York City, demonstrating its compatibility with existing telecom infrastructure.