High-efficiency photon-number-resolving multichannel detector

A balanced eight-port photon-number-resolving detector is developed. The employed scheme is based on an optical-fiber time-multiplexed device with the unique total optical transmittance reaching 93% and a pair of avalanche photodiodes. The balanced operation is achieved even for imperfect unbalanced fiber splitters used in the time-multiplexed device. The complete characterization of the detector for both classical and singlephoton signals is presented. High-speed photon counting at the rates of 100 kHz with the total detection efficiency exceeding 50% is verified.

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