Abstract
ABSTRACT This paper describes the detection of single photons, which have been transmitted through standard fiber at the telecom wavelength of 1310 nm. Following transmission, the 1310-nm photon is up-converted to 710 nm in a periodical-poled LiNbO 3 (PPLN) waveguide and then detected by a silicon-base d avalanche photodiode (Si-APD). The overall detection efficiency of the detector is 20%. We have also characteriz ed the sensitivity of the PPLNs efficiency to temperature and wavelength changes. We focused on the noise property of the up-conversion detector. Without classical channel co-propagation, the dark count rate is 2.2 kHz, which is lower than current up-conversion detectors by more than one order of magnitude. The up-conversion detector is then applied to a QKD system, which is characterized and is shown to have a very strong performance. Keywords: single-photon detector, photon counting, quantum detectors, up-conversion, quantum key distribution, quantum communication, optical communication
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