A photon-number-resolving detector based on a four-element superconductingnanowire single photon detector is demonstrated to have sub-30-ps resolution inmeasuring the arrival time of individual photons. This detector can be used tocharacterize the photon statistics of non-pulsed light sources and to mitigatedead-time effects in high-speed photon counting applications. Furthermore, a25% system detection efficiency at 1550 nm was demonstrated, making thedetector useful for both low-flux source characterization and high-speedphoton-counting and quantum communication applications. The design, fabricationand testing of this detector are described, and a comparison between themeasured and theoretical performance is presented.
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