Extended Data Fig. 3: Frequency shifting/conversion setup.
From: Entanglement of nanophotonic quantum memory nodes in a telecom network
a, Frequency shifting. This setup is used to directly bridge the frequency difference between the two nodes while staying in the visible light range. b, Telecom frequency conversion. This setup is used for long-distance entanglement generation. It contains two frequency conversion stages: one from visible to telecom, and one from telecom to visible. The two stages are separated by a variable amount of fibre spools of total length L, or a field-deployed 35 km fibre.
