Compact 64-channel time-resolved single-photon detection system for quantum photonics applications

We introduce a compact 64-channel detection system tailored for high-precision, time-resolved single-photon measurements in quantum photonic applications such as Boson Sampling and Hong-Ou-Mandel interferometry. The system integrates an 8×8 SPAD array (30 µm active area, 75 µm pitch) with microlenses, achieving a 76% fill-factor, <100 ps jitter, and low dark count rates. Two acquisition boards—each featuring four TACs with four channels—provide 32 timing channels, with a 2:1 multiplexing scheme enabling full array coverage. Time tags are generated via FPGA and transferred through USB 3.0 at rates up to 700 MB/s. This system will support upcoming multi-photon experiments at the Italian Space Agency (ASI).