Photon-graviton conversion in a magnetic field produces a Leggett-Garg inequality violation, but the violation follows from the generic two-level oscillation formula and an invasive measurement protocol, so it is not a valid probe of quantum gravity.
Violation of a Leggett-Garg inequality using ideal negative measurements in neutron interferometry
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We report on an experiment that demonstrates the violation of a Leggett-Garg inequality (LGI) with neutrons. LGIs have been proposed in order to assess how far the predictions of quantum mechanics defy macroscopic realism. With LGIs, correlations of measurements performed on a single system at different times are described. The measured value of K = 1.120 +/- 0.007, obtained in a neutron interferometric experiment, is clearly above the limit K = 1 predicted by macro-realistic theories.
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Violation of the Leggett-Garg inequality in photon-graviton conversion
Photon-graviton conversion in a magnetic field produces a Leggett-Garg inequality violation, but the violation follows from the generic two-level oscillation formula and an invasive measurement protocol, so it is not a valid probe of quantum gravity.