Seminarium Optyczne

Quantum metrology is about extracting information from a system. Quantum communications is about sending information over a network. These simple statements reveal a common ground shared by these two applications, but, simply by reading them aloud, one can realise how connecting them is no trivial matter.In this talk we will discuss some recent progress on how concepts and methods from quantum metrology can become beneficial to quantum communications and vice versa. We will present experiments that use photon pairs as means to establish a quantum communication link via their quantum correlations as well as to realise remote quantum sensing. Notably, not only it is possible to use the quality of the sensor to certify the presence of correlations, but also the quality of the correlations can bound the privacy of the sensing.These experiments are first steps towards integrating sensing capabilities in quantum-secure networks, although such a vision necessitates new technical and conceptual tools.