In this talk, I will present my work at the Istituto Nazionale di Ricerca Metrologica in Turin, Italy. I will begin with an overview of single photon superconducting sensors, followed by an explanation of the theory behind superconducting transition edge sensors. Then, I will demonstrate the in-house fabrication process we employ.

Finally, I will emphasize our active participation in various physics projects, with a specific focus on the Ptolemy project led by Princeton, which is dedicated to detecting relic neutrinos.