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.
Kempf, Journal of Physics A: Mathematical and General 30, 2093 (1997)
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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.