Spacetime effects on wavepackets of coherent light

We investigate the interplay between gravity and quantum coherence present in state of a pulse light propagating curved spacetime. first introduce an operational way to distinguish overall shift wave packet its genuine deformation after propagation. then apply our technique states photons that are coherent frequency degree freedom, as well completely incoherent light. focus on Gaussian profiles combs find initially can enhance induced by propagation background. These results further support claim features, such coherence, be used probe gravitational properties physical systems. specialize techniques Earth-to-satellite communication setups, where effects weak but tested with current satellite technologies.