{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"25956d551bbd2e508f5e958865e8844b6b6fca5fcf8c5913536993cc77673f90","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","e050ab4f450f8b3fd920d0c31c2397fe3e337b18fa40f3342198e79b07cd5dbd"],"salt":"dcaf0b4276eace1ccda9f8e283d22fc9130392902f68b8156fc15be76191a068","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":"2","parents":[],"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 $m \\ge 10^{6}\\,\\mathrm{u}$ ($1.7 \\times 10^{-18}\\,\\mathrm{g}$) 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 $2.5 \\times 10^{3}\\,\\mathrm{cm}/\\mathrm{s}$ in a $10^{2}\\,\\mathrm{cm}$ scale interferometer.","problem_ref":"e050ab4f450f8b3fd920d0c31c2397fe3e337b18fa40f3342198e79b07cd5dbd","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 units","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a6064ce503de7ab0b4fd291e2edb0dfcc9d2b3c9bd784a10519a1831c9dd2f99","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"7e3f154d82203c9c1854cbbcc5ba68a7df1f6a7659f9c846f43da7d954929b0e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"495E3H1uOXFYBVcE5JaoN6TuK5TGb2rJZ8WFCQOVddJy2a9zhxhGZ_-Qhtjb6B2oINehwkL7xtdNRRPh2OWlAQ"},"schema":"pubphys.envelope/1"},"record_hash":"a6064ce503de7ab0b4fd291e2edb0dfcc9d2b3c9bd784a10519a1831c9dd2f99","leaf_index":3728}