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We study the influence of the relativistic redshift on Hong-Ou-Mandel (HOM)interference, and present a genuine quantum test of general relativity. We useGlauber's theory of quantum coherence to predict the coincidence probability ofrealistic broadband photons in HOM-experiments in a non-relativistic setting.We extend the quantum field theoretical framework previously developed todescribe the deformation of the spectral profile of single photons in curvedspacetimes to a multi-photon framework, which is exact for inertial observersin a flat spacetime and an approximation when observers are located in a curvedspacetime. We find that, in case of frequency entangled photons, a mutualredshift between the sender and the receiver can change the coincidencestatistics from photon bunching to photon anti-bunching, and vice versa. Thisimplies that the (anti-) symmetry of the photonic spectral wave function is anobserver dependent notion, and that this can be probed via HOM-experiments in arelativistic setting.

Observer dependence of photon bunching: The influence of the relativistic redshift on Hong-Ou-Mandel interference