#gravitational quantum states

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A neutron guide-tube corridor lined with shielding blocks in an ultracold-neutron beamline hall, one borated-polyethylene block still swung half open on its hinge and a stainless coupling flange at the corridor's end not yet bolted down

The Oldest Quantum-Gravity Experiment Is a Neutron Falling

Ultracold neutrons bouncing on a mirror hold the only bound gravitational states ever measured. A new paper reads their peV ladder as an independent equivalence-principle axis and a dark-energy bound no torsion balance reaches.

By Brecht Corbeel · October 2, 2026 · 15 min read

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