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Context. A new extremely high speed photon-counting photometer, Iqueye, has been installed and tested at the New TechnologyTelescope, in La Silla.Aims. This instrument is the second prototype of a “quantum” photometer being developed for future Extremely Large Telescopes of30–50 m aperture.Methods. Iqueye divides the telescope aperture into four portions, each feeding a single photon avalanche diode. The counts from thefour channels are collected by a time-to-digital converter board, where each photon is appropriately time-tagged. Owing to a rubidiumoscillator and a GPS receiver, an absolute rms timing accuracy better than 0.5 ns during one-hour observations is achieved. The systemcan sustain a count rate of up to 8 MHz uninterruptedly for an entire night of observation.Results. During five nights of observations, the system performed smoothly, and the observations of optical pulsar calibration targetsprovided excellent results

Iqueye, a single photon-counting photometer applied to the ESO new technology telescope