Chiara Marletto

The study settles the debate: Einstein's classical gravity cannot create quantum entanglement between massive bodies. Only if spacetime itself acquires quantum properties does such a connection become possible. This is an important step toward a theory uniting gravity and the quantum world.

Ordinary gravity only attracts. But if the source of gravity is in two places at once, you can make it push a test particle. This is impossible in classical physics and serves as proof of gravity's quantum nature.