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With the advance development in quantum science, constructing a large-scalequantum network has become a hot area of future quantum information technology.Future quantum networks promise to enable many fantastic applications and willunlock fundamentally new technologies in information security and large-scalecomputation. The future quantum internet is required to connect quantuminformation processors to achieve unparalleled capabilities in secretcommunication and enable quantum communication between any two points on Earth.However, the existing quantum networks are basically constructed to realize thecommunication between the end users in their own networks. How to bridgedifferent independent networks to form a fully-connected quantum internetbecomes a pressing challenge for future networks. Here, we demonstrate thequantum fusion of two independent networks for the first time based onmultiuser entanglement swapping, to merge two 10-user networks into a largernetwork with 18 users in quantum correlation layer. By performing the Bellstate measurement between two nonneighboring nodes, the users from differentnetworks can establish entanglement and ultimately every pair of the 18 usersare able to communicate with each other using the swapped states. Our approachopens attractive opportunities for the establishment of quantum entanglementbetween remote nodes in different networks, which facilitates versatile quantuminformation interconnects and has great application in constructing large-scaleintercity quantum communication networks.

Quantum Fusion of Independent Networks Based on Multi-user Entanglement Swapping