A new approach to directly testing quantum gravity

The report says "The physicists haven't conducted any experiments with this device yet — they've spent years just making the thing work. But now that it does work, they can investigate a variety of physical processes, and possibly open the door to quantum gravity. We don't have a fully quantum theory of gravity, which is needed to explain strong gravity at small scales. But this kind of spin interferometer can help us, because it's an easy-to-build device that directly probes the quantum world. For example, you could place a massive object (relatively speaking) next to one of the paths, and use the interference result to measure the strength of gravity at extremely tiny scales. As another example, the spin interferometer could be used as a tiny gravitational wave detector (as ripples in space-time would alter the lengths of the paths), operating at much different frequencies than the current generation of detectors. Whatever's going on in the quantum world, the Stern-Gerlach experiment was one of the first to make it accessible. This device, developed almost a century later, could be the key to digging even deeper."

Should be interesting to see what develops from testing here. Quantum gravity likely comes with space as a quantum foam too. The more QM dumps tiny particles into the vacuum of space, the greater the conflict arises with General Relativity and space expansion (H0 and rate of 3D space expansion), i.e. the cosmological constant. Currently there is 10^120 order of conflict here or even larger.
 
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