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Entanglement is a crucial resource for quantum technologies ranging fromquantum communication to quantum-enhanced measurements and computation. Findingexperimental setups for these tasks is a conceptual challenge for humanscientists due to the counterintuitive behavior of multiparticle interferenceand the enormously large combinatorial search space. Recently, newpossibilities have been opened by artificial discovery where artificialintelligence proposes experimental setups for the creation and manipulation ofhigh-dimensional multi-particle entanglement. While digitally discoveredexperiments go beyond what has been conceived by human experts, a crucial goalis to understand the underlying concepts which enable these new usefulexperimental blueprints. Here, we present Halo (Hyperedge Assembly by LinearOptics), a new form of multiphoton quantum interference with surprisingproperties. Halos were used by our digital discovery framework to solvepreviously open questions. We -- the human part of this collaboration -- werethen able to conceptualize the idea behind the computer discovery and describethem in terms of effective probabilistic multi-photon emitters. We thendemonstrate its usefulness as a core of new experiments for highly entangledstates, communication in quantum networks, and photonic quantum gates. Ourmanuscript has two conclusions. First, we introduce and explain the physics ofa new practically useful multi-photon interference phenomenon that can readilybe realized in advanced setups such as integrated photonic circuits. Second,our manuscript demonstrates how artificial intelligence can act as a source ofinspiration for the scientific discoveries of new actionable concepts inphysics.

Digital Discovery of a Scientific Concept at the Core of Experimental Quantum Optics