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Proceedings Paper

2.23 GHz gating InGaAs/InP single-photon avalanche diode for quantum key distribution
Author(s): Jun Zhang; Patrick Eraerds; Nino Walenta; Claudio Barreiro; Rob Thew; Hugo Zbinden
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Paper Abstract

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.

Paper Details

Date Published: 28 April 2010
PDF: 8 pages
Proc. SPIE 7681, Advanced Photon Counting Techniques IV, 76810Z (28 April 2010); doi: 10.1117/12.862118
Show Author Affiliations
Jun Zhang, Univ. of Geneva (Switzerland)
Patrick Eraerds, Univ. of Geneva (Switzerland)
Nino Walenta, Univ. of Geneva (Switzerland)
Claudio Barreiro, Univ. of Geneva (Switzerland)
Rob Thew, Univ. of Geneva (Switzerland)
Hugo Zbinden, Univ. of Geneva (Switzerland)

Published in SPIE Proceedings Vol. 7681:
Advanced Photon Counting Techniques IV
Mark A. Itzler; Joe C. Campbell, Editor(s)

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