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In recent years, the progress on low temperature detector technologies hasallowed design of large scale experiments aiming at pushing down thesensitivity on the neutrino mass below 1\,eV. Even with outstandingperformances in both energy ($\sim$eV on keV) and time resolution ($\sim1\,\mu$s) on the single channel, a large number of detectors working inparallel is required to reach a sub-eV sensitivity. HOLMES is a new experimentto directly measure the neutrino mass with a sensitivity as low as 2\,eV.HOLMES will perform a calorimetric measurement of the energy released in theelectron capture (EC) decay of 163Ho. In its final configuration, HOLMES willdeploy 1000 detectors of low temperature microcalorimeters with implanted 163Honuclei. The baseline sensors for HOLMES are Mo/Cu TESs (Transition EdgeSensors) on SiN\textsubscript{x} membrane with gold absorbers. The readout isbased on the use of rf-SQUIDs as input devices with flux ramp modulation forlinearization purposes; the rf-SQUID is then coupled to a superconductinglambda/4-wave resonator in the GHz range, and the modulated signal is finallyread out using the homodyne technique. The TES detectors have been designedwith the aim of achieving an energy resolution of a few eV at the spectrumendpoint and a time resolution of a few micro-seconds, in order to minimizepile-up artifacts.

Development of microwave-multiplexed superconductive detectors for the HOLMES experiment