Researchers propose that if a tiny particle is held in a superposition of two positions, its gravity can entangle it with an array of ultra‑precise quantum clocks. Observing this entanglement would give the first evidence that active gravitational mass is quantised, a test that has never been done before. The protocol uses a levitated particle whose own mass and the internal energy of the clocks generate the required relativistic effect. By measuring population differences in the clocks one would detect the entanglement. Crucially, the scheme reduces the expected decoherence time from absurdly long values (~10³¹ s) to feasible scales (~10⁶ s), thanks to the large mass of the particle and the huge number (~10²³) of clocks. However, building such a system remains daunting: it requires creating roughly Avogadro‑sized numbers of nuclear clocks, trapping a Planck‑mass particle, and preserving coherence for many hours.