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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 $m\\ge 1e-6\\,\\mathrm{g}$, 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":null,"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 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