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Article

High-performance superconducting photon-number-resolving detectors with 86% system efficiency at telecom range

Moshkova M., Divochiy A., Morozov P., Vakhtomin Y., Antipov A., Золотов Ф. И., Seleznev V., Ahmetov M., Smirnov K.

The use of improved fabrication technology, highly disordered NbN thin films, and intertwined section topology makes it possible to create high-performance photon-number-resolving superconducting single-photon detectors (PNR SSPDs) that are comparable to conventional single-element SSPDs at the telecom range. The developed four-section PNR SSPD has simultaneously an 86±3%86±3% system detection efficiency, 35 cps dark count rate, ∼2  ns∼2  ns dead time, and maximum 90 ps jitter. An investigation of the PNR SSPD’s detection efficiency for multiphoton events shows good uniformity across sections. As a result, such a PNR SSPD is a good candidate for retrieving the photon statistics for light sources and quantum key distribution systems.