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We investigate the Hong-Ou-Mandel (HOM) effect $-$ a two-photonquantum-interference effect $-$ in the space-time of a rotating spherical mass.In particular, we analyze a common-path HOM setup restricted to the surface ofthe earth and show that, in principle, general-relativistic frame-dragginginduces observable shifts in the HOM dip. For completeness and correspondencewith current literature, we also analyze the emergence of gravitationaltime-dilation effects in HOM interference, for a dual-arm configuration. Theformalism thus presented establishes a basis for encoding general-relativisticeffects into local, multi-photon, quantum-interference experiments.Demonstration of these instances would signify genuine observations of quantumand general relativistic effects, in tandem, and would also extend the domainof validity of general relativity, to the arena of quantized electromagneticfields.

Relativistic frame-dragging and the Hong-Ou-Mandel dip $-$ a primitive to gravitational effects in multi-photon quantum-interference