Gravitationally induced entanglement dynamics of photon pairs and quantum memories

We investigate the effect of gravitationally induced entanglement dynamics -- the basis of a mechanism of universal decoherence -- for photonic states in a quantum field theoretical framework. We discuss the prospects of witnessing the effect by use of quantum memories and delay lines via Hong-Ou-Mandel interference. This would represent a genuine quantum test of general relativity, combining a multi-particle effect predicted by the quantum theory of light and the general relativistic effect of gravitational time dilation.