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We develop single-photon detectors comprising single-mode fiber-coupledsuperconducting nanowires, with high system detection efficiencies at awavelength of 940 nm. The detector comprises a 6.5-nm-thick, 110-nm-wide NbNnanowire meander fabricated onto a Si substrate with a distributed Braggreflector for enhancing the optical absorptance. We demonstrate that, via thedesign of a low filling factor (1/3) and active area ({\Phi} = 10 {\mu}m), thesystem reaches a detection efficiency of ~60% with a dark count rate of 10 Hz,a recovery time <12 ns, and a timing jitter of ~50 ps.

Superconducting nanowire single-photon detectors at a wavelength of 940 nm