Introduction to relativistic quantum information and relativistic effects in optical interferometry

Relativistic quantum information (RQI) applies quantum information science to the problems of relativistic and gravitational physics (both as a technological tool and as conceptual framework) and studies relativistic effects on quantum information carriers. Similarly to its more conventional counterpart RQI combines quantum foundations and technology, and by bringing in additional physical considerations it identifies new limitations on quantum information processing and also provides new possibilities for quantum protocols. As quantum key distribution and other quantum 2.0 technologies are now being deployed in space ambitious sensitivity and stability targets at this frontier reach to previously discarded relativistic effects. Once these effects are within the sensitivity range, we are getting new tools to probe fundamental physics but also facing new fundamental limits on device performance. After briefly outlining different levels of interactions between relativity and quantum information I will describe a novel all-optical test of the Einstein equivalence principle.