Applying standard quantum tomography to data generated by Schrödinger-Newton dynamics yields angle-set-dependent reconstructed covariances that can violate the Heisenberg bound, providing an operational signature of classical gravity.
Measurement of gravitational coupling between millimetre-sized masses.Nature (London), 591(7849):225– 228, March 2021
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Tomography of a Macroscopic Quantum State influenced by Classical Self-Gravity
Applying standard quantum tomography to data generated by Schrödinger-Newton dynamics yields angle-set-dependent reconstructed covariances that can violate the Heisenberg bound, providing an operational signature of classical gravity.