We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with the fastest gating frequency reported so far, of 2.23 GHz, which approaches the limit given by the bandwidth of the SPAD - 2.5 GHz. We propose a useful way to characterize the afterpulsing distribution for rapid gating that allows for easy comparison with conventional gating regimes. We compare the performance of this rapid gating scheme with free-running detector and superconducting single-photon detector (SSPD) for the coherent one-way quantum key distribution (QKD) protocol. The rapid gating system is well suited for both high-rate and long-distance QKD applications, in which Mbps key rates can be achieved for distances less than 40 km with 50 ns deadtime and the maximum distance is limited to ~190km with 5 μs deadtime. These results illustrate that the afterpulsing is no longer a limiting factor for QKD.
@article{arxiv.1002.3240,
title = {2.23 GHz gating InGaAs/InP single-photon avalanche diode for quantum key distribution},
author = {Jun Zhang and Patrick Eraerds and Nino Walenta and Claudio Barreiro and Rob Thew and Hugo Zbinden},
journal= {arXiv preprint arXiv:1002.3240},
year = {2010}
}
Comments
8 pages, 7 figures, submitted to Proceedings of SPIE