Gigahertz quantum key distribution with InGaAs avalanche photodiodes

Z. L. Yuan; A. R. Dixon; J. F. Dynes; A. W. Sharpe; A. J. Shields

doi:10.1063/1.2931070

Gigahertz quantum key distribution with InGaAs avalanche photodiodes

Quantum Physics 2008-05-23 v1

Authors: Z. L. Yuan , A. R. Dixon , J. F. Dynes , A. W. Sharpe , A. J. Shields

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Abstract

We report a demonstration of quantum key distribution (QKD) at GHz clock rates with InGaAs avalanche photodiodes (APDs) operating in a self-differencing mode. Such a mode of operation allows detection of extremely weak avalanches so that the detector afterpulse noise is sufficiently suppressed. The system is characterized by a secure bit rate of 2.37 Mbps at 5.6 km and 27.9 kbps at 65.5 km when the fiber dispersion is not compensated. After compensating the fiber dispersion, the QKD distance is extended to 101 km, resulting in a secure key rate of 2.88 kbps. Our results suggest that InGaAs APDs are very well suited to GHz QKD applications.

Keywords

quantum key distribution InGaAs avalanche photodiodes gigahertz clock rates secure bit rate fiber dispersion

Cite

@article{arxiv.0805.3414,
  title  = {Gigahertz quantum key distribution with InGaAs avalanche photodiodes},
  author = {Z. L. Yuan and A. R. Dixon and J. F. Dynes and A. W. Sharpe and A. J. Shields},
  journal= {arXiv preprint arXiv:0805.3414},
  year   = {2008}
}

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4 pages, 4 figures

Gigahertz quantum key distribution with InGaAs avalanche photodiodes

Abstract

Keywords

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