The CALIPSO project deals with the development and optimization of low temperature (~10 mK) solid state detectors. The goal of the project is to propose new strategies for improving the time resolution of cryogenic scintillating calorimeters, read with NTD thermistors. We will test new NTD-detector coupling techniques and optimize the NTD operation to make the response faster. In parallel, we will work on improving the scintillation light yield for different crystals at low temperatures. Rare events physics experiments utilizing the NTD-detector technology on a large scale, such as the ones searching for the neutrinoless double beta decay (CUORE; CUPID), could profit from the results of this project.