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Generally, a superconducting nanowire single-photon detector (SNSPD) iscomposed of wires with a typical width of ~100 nm. Recent studies have foundthat superconducting strips with a micrometer-scale width can also detectsingle photons. Compared with the SNSPD, the superconducting microstripsingle-photon detector (SMSPD) has smaller kinetic inductance, higher workingcurrent, and lower requirement in fabrication accuracy, providing potentialapplications in the development of ultra-large active area detectors. However,the study on SMSPD is still in its infancy, and the realization of itshigh-performance and practical use remains an opening question. This studydemonstrates a NbN SMSPD with a saturated system detection efficiency (SDE) of~92.2% at a dark count rate of ~200 cps, a polarization sensitivity of ~1.03,and a minimum timing jitter of ~48 ps, at the telecom wavelength of 1550 nmwhen coupled with a single mode fiber and operated at 0.84 K. Furthermore, thedetector's SDE is over 70% when operated at a 2.1-K closed-cycle cryocooler.

Superconducting microstrip single-photon detector with system detection efficiency over 90% at 1550 nm