Quantum Leap: How a New Experiment Could Solve Gravity’s Biggest Mystery

A new study suggests an experimental method to test gravity’s quantum aspects without needing to entangle massive objects, potentially advancing the field significantly. Credit: SciTechDaily.com

Gravity is part of our everyday life. Still, the gravitational force remains mysterious: to this day we do not understand whether its ultimate nature is geometrical, as Einstein envisaged, or governed by the laws of quantum mechanics. Until now, all experimental proposals to answer this question have relied on creating the quantum phenomenon of entanglement between heavy, macroscopic masses.

A drawing of the torsion balance used by Henry Cavendish in 1797 to measure the strength of gravity. Similar ‘harmonic oscillators’ can now be used to reveal the quantumness of gravity.The main problem with the previous proposals is that distant but related massive objects – known as delocalized states – are very challenging to create.

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