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Superconducting nanowire single photon detectors are a key technology forquantum information and science due to their high efficiency, low timingjitter, and low dark counts. In this work, we present a detector for single1550 nm photons with up to 78% detection efficiency, timing jitter below 50 psFWHM, 158 counts/s dark count rate - as well as a world-leading maximum countrate of 1.5 giga-counts/s at 3 dB compression. The PEACOQ detector(Performance-Enhanced Array for Counting Optical Quanta) comprises a lineararray of 32 straight superconducting niobium nitride nanowires which span themode of an optical fiber. This design supports high count rates with minimalpenalties for detection efficiency and timing jitter. We show how thesetrade-offs can be mitigated by implementing independent read-out for eachnanowire and by using a temporal walk correction technique to reduce count-ratedependent timing jitter. These detectors make quantum communication practicalon a 10 GHz clock.

High-speed detection of 1550 nm single photons with superconducting nanowire detectors