Ordinary torsion balances twist if two weights fall slightly differently. But what if the weight exists in multiple states at once—as if it were both light and heavy? This new quantum experiment captures not just the average deviation but also its jitter to test Einstein's equivalence principle and hunt for hints of dark matter.
🎯 The first ultra-precise tests with torsion balances were performed by Hungarian Loránd Eötvös in the early 20th century: he achieved an accuracy of 10^-9—as if noticing that an elephant became lighter by the weight of a single ant.
🎬 In Isaac Asimov's novel 'The End of Eternity,' reality is governed by barely perceptible forces—this quantum test demands the same hypersensitivity.