The QUASAR project (QUantum-based Absolute in-Satellite Radiometric-calibration) aims to revolutionize the calibration of Earth Observation (EO) satellite sensors by overcoming the limitations of conventional systems. Currently, in-orbit calibration relies on ground targets or onboard blackbody sources prone to aging and drift, which threatens the continuity and reliability of essential climate data.
QUASAR introduces a disruptive alternative based on quantum metrology: utilizing photon correlations generated via Spontaneous Parametric Down-Conversion (SPDC). This approach enables the absolute and traceable determination of detector quantum efficiency derived from fundamental physical laws rather than external artifacts or pre-calibrated standards.
Led by INRiM with partners Politecnico di Torino, Starion, and ASTRO, the study evaluates technical feasibility, long-term stability, and the integration of quantum sources into realistic payload architectures. The ultimate goal is to establish a roadmap for advancing this technology to TRL 3-4, providing a clear "quantum advantage" for future ESA missions by ensuring unprecedented accuracy in monitoring Essential Climate Variables (ECVs).
Contributing scientific sectors
