Italian Underground Experiment Finds No Evidence That Gravity Induces Quantum Collapse

In a 62‑day run beneath Italy’s Gran Sasso mountain, physicists tested a long‑standing hypothesis that minuscule spacetime fluctuations from gravity gradually destroy quantum superpositions. Using a highly shielded germanium detector, the team searched for the faint radiation signal the theory predicts. The data revealed no such signal, placing a stringent limit on gravity‑induced decoherence. The result challenges the idea that gravity is the mechanism that collapses quantum states into classical outcomes. While the experiment does not rule out all collapse models, it narrows the parameter space for theories that link gravity to quantum measurement. Researchers will now focus on alternative explanations for the quantum‑to‑classical transition and design new experiments to probe the remaining possibilities.