[bckr]

Excellent idea! Also this whole experiment is really exciting. I'd heard of quantum entanglement being demonstrated with larger objects, but this is the first I've heard of measuring gravity between small objects. It seems like this must eventually lead to quantum gravity, or. . . something else!

[krastanov]

The issue is that gravity and quantum mechanics contradict each other only when the curvature of spacetime is significant, which is not the case here. Still, it would be amazing to measure gravitational field from an entangled object... But I do not expect to see this during my natural lifetime.

[simiones]

I believe QM and GR contradict each other for any curvature, but measuring the extremely small curvature/gravitational effects caused by a single particle would require enormous amounts of energy. Specifically the problem is the way that the uncertainty principle interacts with GR's assumptions.

[krastanov]

In flat space time you have QFT, which does not have severe problems until you make the gravitational fields very strong.

[simiones]

Isn't QFT limited to 0 (or otherwise negligible) gravitational interaction between particles/space-time?

[tasty_freeze]

I don't believe that is true. For example, if this experiment can be carried out with much smaller masses, they could find that the attractive force isn't smooth but is instead stair-stepped, which would imply some kind of quantization in space or gravity.