Backflashes from fast-gated avalanche photodiodes in quantum key distribution

@article{KoehlerSidki2020BackflashesFF,
  title={Backflashes from fast-gated avalanche photodiodes in quantum key distribution},
  author={Alexander Koehler-Sidki and James F. Dynes and Taofiq K. Para{\"i}so and Marco Lucamarini and A. W. Sharpe and Z. L. Yuan and Andrew J. Shields},
  journal={arXiv: Quantum Physics},
  year={2020}
}
InGaAs single-photon avalanche photodiodes (APDs) are key enablers for high-bit rate quantum key distribution. However, the deviation of such detectors from ideal models can open side-channels for an eavesdropper, Eve, to exploit. The phenomenon of backflashes, whereby APDs reemit photons after detecting a photon, gives Eve the opportunity to passively learn the information carried by the detected photon without the need to actively interact with the legitimate receiver, Bob. Whilst this has… 

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