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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 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