Low-noise PPLN-based single-photon detector

Hai Xu; Lijun Ma; Oliver Slattery; Xiao Tang

doi:10.1117/12.734345

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10 September 2007 Low-noise PPLN-based single-photon detector

Hai Xu, Lijun Ma, Oliver Slattery, Xiao Tang

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Proceedings Volume 6780, Quantum Communications Realized; 67800U (2007) https://doi.org/10.1117/12.734345
Event: Optics East, 2007, Boston, MA, United States

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 LiNbO₃ (PPLN) waveguide and then detected by a silicon-based avalanche photodiode (Si-APD). The overall detection efficiency of the detector is 20%. We have also characterized the sensitivity of the PPLN's 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.

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Hai Xu, Lijun Ma, Oliver Slattery, and Xiao Tang "Low-noise PPLN-based single-photon detector", Proc. SPIE 6780, Quantum Communications Realized, 67800U (10 September 2007); https://doi.org/10.1117/12.734345

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