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Niobium Nitride (NbN) nanowire is the most popular detection material ofsuperconducting nanowire single photon detectors (SNSPDs) for high repetitionrate and high efficiency. However, it has been assumed to be difficult forfabricating SNSPDs with arrays over large area, which are critical componentsof quantum imaging, linear optical quantum computing, satellite laser ranging,and high-speed quantum key distribution. This paper reported a 4*4 pixel NbNSNSPDs array with an equivalent receiving aperture of 300 micrometer associatedwith beam compression technology, which is the first NbN SNSPD coupled by 300micrometer fiber according to our knowledge. The designed pixel was compactwith a filling factor of 98.5%, resulting in a high quantum efficiency of94.5%, a system efficiency of 46% for photons coupled from 300 micrometer fiberwithout optimizing polarization, and a system time resolution of 92 ps. Thiswork demonstrates the feasibility of a large SNSPDs array, and paves the wayfor developing efficient photon camera with NbN nanowires.

A 16-pixel NbN nanowire single photon detector coupled with 300 micrometer fiber