Overview
- Nature Communications published the ANU result showing Bell-type correlations in the motion of helium atoms.
- The team created ultracold clouds called Bose–Einstein condensates and collided them to generate momentum‑entangled pairs.
- An atom interferometer adapted from a photon Rarity–Tapster design read the joint momenta of each pair.
- The data indicated each atom shared multiple momentum states before measurement, matching quantum predictions of matter superposition.
- Pair production was about one per run in an 8 cm setup, and the researchers say closing the locality loophole will need separations near 30 cm plus new funding and years of work for gravity‑relevant tests.