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Atom interferometers have checked this to about one part in $10^{12}$, while a satellite with solid masses reached one part in $10^{15}$.","posed_since":"","precise":"Dual-species atom interferometry (Rb-85/Rb-87, Asenbaum et al 2020) bounds the Eotvos parameter $\\eta$ at about 1e-12; MICROSCOPE bounds $\\eta(\\mathrm{Ti}, \\mathrm{Pt})$ at about 1e-15 (2022). Determine $\\eta$ for a pair of quantum test masses with uncertainty at or below 1e-15, for example in a $100\\,\\mathrm{m}$ class tower or in space.","problem_ref":null,"references":"","settled_by":"A dual-species interferometer result for $\\eta$ with total uncertainty below 1e-15 (MAGIS-100, AION, STE-QUEST class).","status_note":"","title":"Atom-interferometric test of universality of free fall at 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