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28 April 2010 2.23 GHz gating InGaAs/InP single-photon avalanche diode for quantum key distribution
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We implement an InGaAs/InP single-photon avalanche diode (SPAD) for single-photon detection with the fastest gating frequency reported so far, of 2.23GHz, 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 40km 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.
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Jun Zhang, Patrick Eraerds, Nino Walenta, Claudio Barreiro, Rob Thew, and Hugo Zbinden "2.23 GHz gating InGaAs/InP single-photon avalanche diode for quantum key distribution", Proc. SPIE 7681, Advanced Photon Counting Techniques IV, 76810Z (28 April 2010);

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