Avoiding the blinding attack in QKD

ZL Yuan, JF Dynes, AJ Shields - Nature Photonics, 2010 - nature.com
Figure 1| InGaAs APD under CW illumination. The APD is thermo-electrically cooled to− 30
C and driven by voltage pulses of 3.5 ns, 4 V and 2 MHz. The excess bias is set to 2.5 V by
the dc bias (VHV) in the single-photon counting regime. A CW laser of wavelength 1.55 µm
is used for illumination. a, A schematic for gated-mode operation and two APD output
waveforms that trigger a photon click. b, c, Count probability against incident optical power
for a biasing resistor (Rbias) of varying impedance (b) and for two differing discrimination …

Avoiding the blinding attack in QKD

L Lydersen, C Wiechers, C Wittmann, D Elser… - Nature …, 2010 - nature.com
Lydersen et al. reply: We are glad that our results have improved awareness and stimulated
discussions concerning the imperfections of detectors, particularly among the leading
research groups that use APDs in QKD systems. Yuan et al. propose a method to avoid the
blinding of gated APD-based detectors, such as those used in the two commercial QKD
systems addressed in our recent publication1. Our experimental data from Clavis2 indicate
that the countermeasure suggested by Yuan et al. will make it more difficult to blind gated …
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