Single-photon detectors, including those that resolve the number of photons, play a key role in experimental research in the field of quantum optics and quantum computer science. However, such detectors have a number of disadvantages, and the choice of a detector is always a trade-off [1] between such characteristics as quantum efficiency, dead time, etc. In view of this, part of the information is lost and distorted during measurements, which negatively affects the experimental data obtained. The study suggests method for tomography of photon-number-resolving single-photon detectors. By means of the proposed method, the main characteristics of detectors and radiation sources are restored. The proposed method are tested on the simplest models.
$^1$Quantum Technology Centre, Faculty of Physics, Lomonosov Moscow State University, chair of Quantum electronics .\
$^2$Institute of Physics and Technology, Russian Academy of Sciences
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