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In the past decade superconducting nanowire single photon detectors (SNSPDs)have gradually become an indispensable part of any demanding quantum opticsexperiment. Until now, most SNSPDs are coupled to single-mode fibers. SNSPDscoupled to multimode fibers have shown promising efficiencies but are yet toachieve high time resolution. For a number of applications ranging from quantumnano-photonics to bio-optics, high efficiency and high time-resolution aredesired at the same time. In this paper, we demonstrate the role ofpolarization on the efficiency of multi-mode fiber coupled detectors, and showhow it can be addressed. We fabricated high performance 20, 25 and 50{\mu}mdiameter detectors targeted for visible, near infrared, and telecomwavelengths. A custom-built setup was used to simulate realistic experimentswith randomized modes in the fiber. We simultaneously achieved systemefficiency >80% and time resolution <20 ps and made large detectors that offeroutstanding performances.

Multimode Fiber Coupled Superconducting Nanowire Single Photon Detectors with High Detection Efficiency and Time Resolution