Random spacetime fluctuations would decohere quantum systems in momentum space, and a superconducting-qubit-controlled 16 µg mechanical resonator places weak upper bounds on the fluctuation parameters.
The measurements we consider results in the bound lk≤ 5.9(8) · 10−20 m
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Quantum gravitational decoherence of a mechanical oscillator from spacetime fluctuations
Random spacetime fluctuations would decohere quantum systems in momentum space, and a superconducting-qubit-controlled 16 µg mechanical resonator places weak upper bounds on the fluctuation parameters.