Testing superposition of spacetime curvature

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Maximus_Ann
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Analogous to Bell's theorem testing: for particle in superposition of locations detecting spacetime curvature to test if spacetime can be in superposition
How is humanity technologically ready for testing below:
Something analogous to Bell's theorem testing: for particle(s) in superposition of locations detecting spacetime curvature to test if spacetime can be in superposition.
Does above test make sense theoretically even if far from technologically feasible?
 
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https://physics.aps.org/articles/v10/s138
Some preliminary proposals for testing the quantum nature of gravity by seeing if it can be used to entangle two particles. Such experiments are challenging because you need both heavy objects (to ensure gravity is the dominant force) and delocalized states (to ensure entanglement). These two properties are hard to obtain simultaneously.

[edit] - https://arxiv.org/pdf/1707.06036 : A recent proposal that was published in PRL

https://journals.aps.org/prx/abstract/10.1103/PhysRevX.14.021022
An alternative experiment proposal that avoids the above problem. The authors identify an inequality, an upper bound on the inequality, and the implication of a violation of that bound: quantum gravitational interaction.
 
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