{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"901ce7c9bd67fbf642cd058423334558769e79085be5e2be1d92ea707afd0d30","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["09f470c339a8d0c8d8622f5fdaf86b26a93181d42ef096b50560fb0e0922a674","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"edaf43daaabe8169a0da3b0031eae391dc46d61f73a3996c047a6d732c218165","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.macro-superpositions.megadalton-interference","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"09f470c339a8d0c8d8622f5fdaf86b26a93181d42ef096b50560fb0e0922a674","relation":"special_case"}],"plain":"The heaviest particles shown to interfere in a way classical physics cannot mimic weigh about 170,000 atomic mass units. Reaching a million or more, the mass of a small virus, requires slower beams and longer coherence.","posed_since":"","precise":"Demonstrate near-field (Talbot-Lau) or far-field interference of neutral particles of mass $m \\ge 1e6\\,\\mathrm{u}$ ($1.7e-18\\,\\mathrm{g}$) whose visibility versus grating power follows the quantum prediction and excludes the classical moire-shadow prediction at stated confidence, and report $\\mu$. The 2025 analysis indicates metal clusters need velocities near $2.5e3\\,\\mathrm{cm}/\\mathrm{s}$ in a $1e2\\,\\mathrm{cm}$ scale interferometer.","problem_ref":null,"references":"","settled_by":"A Talbot-Lau or vertical interferometer run with MDa clusters, nanoparticles or biomolecules in which quantum and classical predictions differ and the data follow the quantum one.","status_note":"In 2025 sodium clusters of 0.4 to 1 MDa gave high-visibility fringes, but at their velocities quantum and classical predictions coincide (arXiv:2507.21211).","title":"Matter-wave interference with particles above one million atomic mass 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