Single-photon detectors face a tradeoff between timing precision and dynamic range. Avalanche photodiodes achieve picosecond timing but saturate at high count rates — each detection event triggers an avalanche that takes nanoseconds to quench. Photomultiplier tubes handle higher rates but with worse timing. The physics of amplification limits how fast you can reset.
PhotonPix (arXiv:2603.21848) achieves 10-picosecond timing resolution with high dynamic range. Ten picoseconds is the time light travels 3 millimeters. At this resolution, time-of-flight measurements can locate objects with millimeter precision using individual photons.
High dynamic range means the detector doesn't saturate when photon flux is high — it can measure bright and dim signals in the same scene without switching modes. The combination matters for applications like LIDAR (where background sunlight is bright but the return signal is single-photon) and fluorescence lifetime imaging (where the lifetime is nanoseconds but the timing precision needs to be picoseconds).
The through-claim: timing precision and dynamic range aren't fundamentally opposed — they're coupled through the recovery mechanism. If the detector can reset faster than the dead time between photon arrivals, both improve together. The 10-picosecond resolution sets the precision; the fast recovery sets the rate. The physics that enables one enables the other.