Fig. 1: Sketch of a triangle quantum network.
From: Quantum LOSR networks cannot generate graph states with high fidelity

Here three bipartite sources ςa, ςb and ςc are distributed to three parties A, B, C, e.g., the source states ςa are sent to B and C. Each party can apply local operations \({{{{\mathcal{E}}}}}_{X}^{(\lambda )}\) (X = A, B, C) on the received particles, which are affected by global shared randomness λ.