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Building communication links among multiple users in a scalable and robustway is a key objective in achieving large-scale quantum networks. In realisticscenario, noise from the coexisting classical light is inevitable and canultimately disrupt the entanglement. The previous significant fully connectedmultiuser entanglement distribution experiments are conducted using dark fiberlinks and there is no explicit relation between the entanglement degradationsinduced by classical noise and its error rate. Here we fabricate asemiconductor chip with a high figure-of-merit modal overlap to directlygenerate broadband polarization entanglement. Our monolithic source maintainspolarization entanglement fidelity above 96% for 42 nm bandwidth with abrightness of 1.2*10^7 Hz/mW. We perform a continuously working quantumentanglement distribution among three users coexisting with classical light.Under finite-key analysis, we establish secure keys and enable imagesencryption as well as quantum secret sharing between users. Our work paves theway for practical multiparty quantum communication with integrated photonicarchitecture compatible with real-world fiber optical communication network.

Coexistence of multiuser entanglement distribution and classical light in optical fiber network with a semiconductor chip