Ordinary Gravity Doesn't Entangle Particles express
Gravity is like a stretched trampoline: massive bodies press into it, making other bodies roll toward them. This shared curvature of space, gravity, affects everyone, but it doesn't convey secret messages. For quantum entanglement to arise, an exchange of special particles is needed, as if the balls on the trampoline were tossing smaller balls back and forth to synchronize.
In the quantum world, such tricks work thanks to mediators, like particles of the Standard Model. Even gravitational waves, ripples from the motion of massive bodies, don't carry quantum instructions. A recent study claimed the opposite, but a new analysis found an error: they didn't account for all the dents in the trampoline: they overlooked small but crucial ones. It's like trying to assemble a puzzle without the corner pieces. But here's the striking bit: even if you place a mass as big as Everest on the trampoline, gravity won't entangle the particles. For that, the quantum nature of spacetime itself is required.
Original abstract
as written by the authors arXiv:2604.19696
A recent paper published on Nature [Nature,646,813(2025)] by Aziz and Howl, claims that quantum particles become entangled when they interact gravitationally, even if the gravitational potential is treated classically. We show that the entanglement found by the authors stems from discarding some of the transition amplitudes, which, when kept, guarantee that an initially factorized state remains so over time. Therefore, no entanglement is generated by the classical gravitational interaction in the scenario considered by the authors.
Gravity is so weak that even if you concentrated the mass of an entire mountain into one point, its quantum influence would remain ghostly. That's why hunters of quantum gravity dream of accelerators the size of the Solar System.