{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f40921bc7bed5303fee9e9cc400e638d1a6bff6c3a43b3aea6e21bef8d12e26c","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"c800a1770245f998acf94923a7c8e13392961d526a074a1765eee145c98c7549","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.measurement-problem.higher-order-interference","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The Born rule implies that interference always comes from pairs of paths, so a three-slit pattern is fixed by the two-slit and one-slit patterns. A leftover three-path term would show the Born rule is wrong.","posed_since":"1994","precise":"Sorkin's third-order term $I_3 = P_{ABC} - P_{AB} - P_{AC} - P_{BC} + P_A + P_B + P_C - P_0$ ($P_S$ = detection probability with slit set $S$ open) vanishes identically if $p = \\mid \\psi \\mid^2$. Measure $\\kappa = I_3 / \\delta$, with delta a normalization such as the sum of magnitudes of the two-path interference terms, for photons, massive particles or many-particle states, and either detect $\\kappa != 0$ or bound it below the systematic floor set by nonclassical looped paths.","problem_ref":null,"references":"","settled_by":"A multi-path interferometer measurement with systematics, including looped-path corrections, controlled below the target $\\kappa$.","status_note":"Photonic, NMR and single-spin tests since 2010 found $\\kappa$ consistent with zero; 2024-2026 proposals and analyses extend the test to Bose-Einstein condensates, attosecond photoionization and collider scattering.","title":"Is there three-path interference beyond what the Born rule 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