{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2b80202f796237a75ac9d9cb2a23d03956aa773b060674786a183fb84fb3f95e","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5d27ad3a73f68b2d609f70299eaf28900b3e115f8e9dee5b2f1a43025a119244","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"6c6224348f3f2604f71c0caa95922e02c43ecc5525371a78f556b91d67ac2679","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.macro-superpositions.leggett-garg-massive","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Macrorealism is the everyday assumption that a large object always has a definite state that can be checked without disturbing it. A Leggett-Garg test checks this by measuring one object at several times; a convincing test with a heavy mechanical object is missing.","posed_since":"1985","precise":"For a mechanical mode of effective mass $m\\ge 10^{-6}\\,\\mathrm{g}$, measure two-time correlators $C_{ij}$ of a two-valued observable at $t_1<t_2<t_3$ and test $K=C_{12}+C_{23}-C_{13}\\le 1$, using ideal negative-result or control-experiment protocols that close the clumsiness loophole (disturbance by the measurement itself). An answer is $K>1$ at stated significance with invasiveness bounded by independent controls.","problem_ref":"5d27ad3a73f68b2d609f70299eaf28900b3e115f8e9dee5b2f1a43025a119244","references":"","settled_by":"A loophole-controlled Leggett-Garg violation on a microgram-scale mechanical mode.","status_note":"Cat states of a 16 microgram bulk acoustic resonator were made in 2023 (Bild et al., Science); no loophole-controlled Leggett-Garg test at such masses was found in the literature checked.","title":"Leggett-Garg violation with a massive mechanical oscillator","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a0b9b8cff586251cc46cafb57ecdcbc3a45bf264f4f5fc0416910fe719cb3726","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"980338c9937698d3d66bb95ac5749d973c0f19d07984274eda88c2433e041bd5","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"GlMhwlLx8mt3GzZsJ7-9K1Pspx66XubxvIRUWaP_g_Ut8sU0VUDhwVDU2QK6smOEBIgiFFGoqIC_vma6uPzZAQ"},"schema":"pubphys.envelope/1"},"record_hash":"a0b9b8cff586251cc46cafb57ecdcbc3a45bf264f4f5fc0416910fe719cb3726","leaf_index":3724}