  We report a compact, scalable, and high-performance superconducting nanowire
single-photon detector (SNSPD) array by using a multichannel optical fiber
array-coupled configuration. For single pixels with an active area of 18 um in
diameter and illuminated at the telecom wavelength of 1550 nm, we achieved a
pixel yield of 13/16 on one chip, an average system detection efficiency of 69%
at a dark count rate of 160 cps, a minimum timing jitter of 74 ps, and a
maximum count rate of ~40 Mcps. The optical crosstalk coefficient between
adjacent channels is better than -60 dB. The performance of the fiber
array-coupled detectors is comparable with a standalone detector coupled to a
single fiber. Our method is promising for the development of scalable,
high-performance, and high-yield SNSPDs.
