Partially funded by the European Union (ERC, QuESADILLA, 101042399). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency. Neither the European Union nor the granting authority can be held responsible for them. This work has received funding from the German Ministry of Education and Research within the PhoQuant project (grant number 13N16103).

The data set consists of 1.1 million electrical output signals (traces) from a superconducting nanowire single-photon detector (SNSPD) from Single Quantum. These traces were recorded with an oscilloscope (21 GHz bandwidth, 128GSa/s) for varying incident mean photon numbers between 0.5 and 5 in steps of 0.5 photons per pulse (generated with a laser, i.e., coherent states). More information can be found in the accompanying publication.