Observations of optical pulsars with two high time resolution photometers at Asiago and NTT

We have built two single photon very high speed photometers (AquEYE for the Asiago 1.8 m telescope and IquEYE for the 3.5 m ESO NTT) as prototypes of a quantum photometer for the 42 m European Extremely Large Telescope (E‐ELT). The two photometers are the most accurate time machines available to optical astronomy. The arrival time of each detected photon is referenced to UTC with a precision better than 500 picoseconds, continuously for hours of data acquisition. We report timing results for three optical pulsars.