We can now test quantum gravity directly, in a controlled lab setting. Here's how.
Levitating diamonds spinning at 20 Mhz (about a billion rpm).
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These diamonds are created in the lab by doping with nitrogen vacancies. This causes them to emit quantum signals that can be directly monitored.
The experimental apparatus is small. It consists of an electrical O-ring and a couple of lasers. It will easily fit inside a spinning wheel 10 m in diameter, which is sufficient to generate 1G.
engines.egr.uh.edu
Or, they could put in on a spaceship or satellite, where Earth's gravity can't be felt.
Levitating diamonds spinning at 20 Mhz (about a billion rpm).

“Levitating Diamonds Reach Impossible Speed”: Spinning at 1.2 Billion RPM, They’re Cracking Open the Secrets of Quantum Gravity - Sustainability Times
IN A NUTSHELL 🔬 Levitating and spinning diamonds at 1.2 billion RPM reveal insights into quantum physics and gravity. 💎 Researchers at Purdue University utilize nanodiamonds with nitrogen-vacancy centers to detect magnetic fields. ✨ The experiment explores the Berry phase and its effect on spin...

These diamonds are created in the lab by doping with nitrogen vacancies. This causes them to emit quantum signals that can be directly monitored.
The experimental apparatus is small. It consists of an electrical O-ring and a couple of lasers. It will easily fit inside a spinning wheel 10 m in diameter, which is sufficient to generate 1G.

Artificial Gravity
by Michael Barratt Today, astronaut Michael Barratt discusses the pros and cons of artificial gravity. The University of Houston presents this series about the machines that make our civilization run, and the people whose ingenuity created them.
Or, they could put in on a spaceship or satellite, where Earth's gravity can't be felt.