The Key to Quantum Gravity Lies in a Single Atom ⚡ экспресс
Experiments on gravitationally mediated entanglement use arguments from quantum information: detecting entanglement through gravitational interaction would rule out a classical description of gravity. However, such experiments are currently technologically out of reach. It has been shown that existing matter-wave interferometers can indirectly prove that gravity creates entanglement between two systems. If one experimentally verifies the Schrödinger equation for a single delocalized system gravitationally interacting with an external mass, then under one of two reasonable assumptions, the time evolution of two such systems inevitably generates gravitationally mediated entanglement. Thus, instead of directly creating entanglement, it suffices to check the quantum dynamics of a single system in a gravitational field.
Gravity — the curvature of spacetime — has long evaded a quantum description. To prove its quantum nature, you typically need to create entanglement between two massive objects, which is technically unfeasible. Physicists proposed a different path: monitor a single atom.
The quantum behavior of an atom is like a dance. The particle is in two places at once, and gravity guides its movements. If this dance obeys the Schrödinger equation, then two atoms automatically synchronize — their states become intertwined through gravity. Such 'steps' can be captured by matter-wave interferometers, noting the slightest shifts.
The sensitivity of the instruments is astonishing: they detect the attraction of a brick at a meter's distance. That's enough to notice quantum jitter. Just as detectors catch gravitational waves from black holes, new setups will reveal the gravitational dance of a particle. One precisely measured step will prove: gravity can entangle. Einstein's theory and quantum mechanics are converging.
🎯 The most sensitive atom interferometers can notice a change in gravity caused by a single brick at a meter's distance.