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.
Hofer, Jason Hoelscher- Obermaier, Ralf Riedinger, Klemens Hammerer, and Markus 17 Aspelmeyer
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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.