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Chiral excitation flows have drawn a lot of attention for their uniqueunidirectionality. Such flows have been studied in three-node networks withsynthetic gauge fields (SGFs), while they are barely realized as the number ofnodes increases. In this work, we propose a scheme to achieve chiral flows in$n$-node networks, where an auxiliary node is introduced to govern the system.This auxiliary node is coupled to all the network nodes, forming sub-trianglestructures with interference paths in these networks. We find the implicitchiral symmetry behind the perfect chiral flow and propose the universalcriteria that incorporate previous models, facilitating the implementation ofchiral transmission in various networks. By investigating the symmetries withinthese models, we present different features of the chiral flow in bosonic andspin networks. Furthermore, we extend the four-node model into a laddernetwork, which is promising for remote state transfer in practical systems withless complexity. Our scheme can be realized in state-of-the-art experimentalsystems, such as superconducting circuits and magnetic photonic lattices,thereby opening up new possibilities for future quantum networks.

Chiral excitation flows of multinode network based on synthetic gauge fields