Picosecond Synchronization System for the Distribution of Photon Pairs through a Fiber Link between Fermilab and Argonne National Laboratories

We demonstrate a three-node quantum network for C-band photon pairs using 2 of 59 km deployed fiber between Fermi and Argonne National Laboratories. The are directed to nodes standard telecommunication switch the detection system is synchronized picosecond-scale timing resolution coexisting O- or L-band optical clock distribution system.We measure reduction coincidence-to-accidental ratio (CAR) from 51 ± 5.3 0.4 due Raman scattering O-band pulses. Despite this reduction, CAR nevertheless suitable networks.