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Shortly after their inception, superconducting nanowire single-photondetectors (SNSPDs) became the leading quantum light detection technology. Withthe capability of detecting single-photons with near-unity efficiency, hightime resolution, low dark count rate, and fast recovery time, SNSPDs outperformconventional single-photon detection techniques. However, detecting lowerenergy single-photons (<0.8 eV) with high efficiency and low timing jitter hasremained a challenge. To achieve unity internal efficiency at mid-infraredwavelengths, previous works used amorphous superconducting materials with lowenergy gaps at the expense of reduced time resolution (close to a nanosecond),and by operating them in complex mK dilution refrigerators. In this work, weprovide an alternative approach with SNSPDs fabricated from 5-9.5 nm thickNbTiN superconducting films and devices operated in conventionalGifford-McMahon (GM) cryocoolers. By optimizing the superconducting filmdeposition process, film thickness and nanowire design, our fiber-coupleddevices achieved > 70% system detection efficiency (SDE) at 2 {\mu}m and sub-15ps timing jitter. Furthermore, detectors from the same batch demonstrated unityinternal detection efficiency at 3 {\mu}m and 80% internal efficiency at 4{\mu}m, paving the road for an efficient mid-infrared single-photon detectiontechnology with unparalleled time resolution and without mK coolingrequirements.

Mid-infrared Single-photon Detection Using Superconducting NbTiN Nanowires with Sub-15 ps Time Resolution in a Gifford-McMahon Cryocooler