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The goal is to build one with many photons and check its unusual properties.","posed_since":"","precise":"Bosonic Laughlin state at filling $\\nu = 1/2$ of Rydberg polaritons in a twisted (non-planar) optical cavity. Prepare it with $N \\ge 10$ photons and verify topological order through the fractional braiding phase or edge excitations. Answer: achieved $N$ and fidelity, and the loss process limiting further growth.","problem_ref":null,"references":"","settled_by":"Measurement of a fractional braiding phase or chiral edge spectrum in a photonic fluid of at least 10 particles.","status_note":"Two-photon Laughlin states were observed in 2020 (Clark et al., Nature).","title":"Fractional quantum Hall states of light with many 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