  We consider the time delay of interfering single photons oppositely traveling
in the Kerr metric of a rotating massive object. Classically, the time delay
shows up as a phase difference between coherent sources of light. In quantum
mechanics, the loss in visibility due to the indistinguishability of
interfering photons is directly related to the time delay. We can thus observe
the Kerr frame-dragging effect using the Hong-Ou-Mandel (HOM) dip, a purely
quantum mechanical effect. By Einstein's equivalence principle, we can
analogously consider a rotating turntable to simulate the Kerr metric. We look
at the feasibility of such an experiment using optical fibre, and note a
cancellation in the second-order dispersion but a direction-dependent
difference in group velocity. However, for the chosen experimental parameters,
we can effectively assume light propagating through a vacuum.
