For the first time, scientists have observed Einstein’s gravity acting on an object in a quantum state.<br /><br />By placing rubidium atoms in different paths, the experiment tested the equivalence principle at the quantum scale. The result offers a remarkable new connection between quantum mechanics and general relativity—and opens the door to even more extreme tests.<br /><br />This episode includes AI-generated content.

The Quark Side is a quantum physics podcast that explores the strange foundations of reality—from quarks and fields to spacetime, uncertainty, and the limits of knowledge. Each episode breaks down cutting-edge research and deep ideas in modern physics with clarity, rigor, and curiosity, revealing how the quantum world shapes everything we observe.