We tested an ultra-fast four-element low-jitter Si single-photon avalanche diode (SPAD) of EPFL, Neuchâtel, for TCSPC time resolution and timing jitter. With a bh SPC-150-NXX TCSPC module we obtained an IRF width of 8.7 ps to 9.2 ps FWHM for the individual detector elements. These values correspond to an RMS timing jitter of about 5.2 ps. With these values, the detector is the fastest high-performance SPAD currently known, surpassed only by superconducting single-photon detectors (SSPDs).
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