Real-time multi-pixel readout of superconducting nanowire single-photon detectors

Nowadays detection systems based on superconducting nanowire single-photon detectors (SNSPD) are mainly with a single-pixel detector. Multi-pixel systems would extend the field of possible applications. Therefore, new concepts are required for effective readout of multi-pixel SNSPDs. We give an overview of possible concepts, conditions of operation and dedicated effort to optimize the requirements of different applications in the single-photon regime.