Eyuri Wakakuwa

Two spinning tops whirl in an invisible dance, tied together by a thread of spacetime. One of them, massive and rotating, is in a superposition of two opposite directions of rotation. The second, a light test particle, moves in a circle around the first. Their motions intertwine, generating quantum entanglement through the gravitational field.

Gravity in our world is curved spacetime. That's how Einstein's general theory of relativity describes it. But what happens to gravity at the level of atoms and particles, where quantum mechanics rules? This question has remained unanswered for nearly a century.