Classical Gravity Distorts Quantum Snapshots express
Photographing hummingbird wings with an ordinary camera gives a blurry smudge. For a sharp picture, you take many rapid shots from different angles and piece them together: that's how a quantum 'snapshot' is made. In the lab, scientists 'feel' the vibrations of a tiny mirror with a laser beam. By tracking changes in the light, they reconstruct the quantum state of this motion.
But gravity might behave differently. The Schrödinger–Newton theory suggests it remains a classical field. Then the mirror's own gravity makes it jiggle in sync with the measurement, like a camera shaking in unison with the subject. The resulting 'photograph' violates a fundamental ban, the Heisenberg uncertainty limit, like an impossibly ultra-sharp frame. Such anomalies would be a signal: if they appear, gravity is classical. It's a way to test the nature of gravity in the lab; if it turns out to be quantum, gravitational waves would appear as a stream of particles.
According to the Schrödinger-Newton theory, every object gravitationally attracts itself, and this tiny force can distort a quantum experiment.