Leonardo Gasparini, Majid Zarghami, Matteo Perenzoni, Luca Parmesan, Manuel Moreno Garcia, Valentin Mitev, Laurent Balet, Nicolas Torcheboeuf, Dmitri Boiko, Manuel Unternährer, Bänz Bessire and André Stefanov SUPERTWIN is a H2020 European FET-OPEN project that aims at building an all-solid-state super-resolution quantum microscope exploiting the non-classical correlations existing among entangled N-photon states. The project poses significant challenges on the detector in terms of efficiency. The parameters of interest include photon detection efficiency (PDE), timing resolution, spatial resolution and duty cycle. The SUPERTWIN detectors are arrays of Single-Photon Avalanche Diodes in CMOS technology that indentify N-photon states by means of the time of arrival of photons at a relatively high efficiency.