A Gravity of Earth Measurement with a qBOUNCE Experiment

Understand

We report a measurement of the local acceleration $g$ with ultracold neutrons based on quantum states in the gravity potential of the Earth.

• The new method uses resonant transitions between the states $|1> -> |3>$ and for the first time between $|1> -> |4>$.
• The measurements demonstrate that Newton's Inverse Square Law of Gravity is understood at micron distances at an energy level of $10^{-14}$ eV with $\frac{\Delta g}{g}=4\times10^{-3}$.
• The results provide constraints on any possible gravity-like interaction at a micrometer interaction range.