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We show how the same set-up and procedure, exploiting spatially multi-modequantum correlations, allows the absolute calibration of a EMCCD camera fromthe analog regime down to the single photon counting level, just by adjustingthe brightness of the quantum source. At single photon level EMCCD can beoperated as an on-off detector, where quantum efficiency depends on thediscriminating threshold. We develop a simple model to explain the connectionof the two different regime demonstrating that the efficiency estimated in theanalog (bright) regime allows to accurately predict the detector behaviour inthe photo-counting regime and vice-versa. This work establishes a bridgebetween two regions of the optical measurements that up to now have been basedon completely different standards, detectors and measurement techniques.

Absolute calibration of an EMCCD camera by quantum correlation linking photon counting to analog regime