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.
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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.