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After-gate attack on a quantum cryptosystem

Wiechers, Carlos; Lydersen, Lars Vincent Van de Wiel; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes; Marquardt, Christoph; Makarov, Vadim; Leuchs, Gerd
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2357774
Date
2011
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  • Publikasjoner fra CRIStin - NTNU [41881]
Original version
New Journal of Physics 2011, 13   10.1088/1367-2630/13/1/013043
Abstract
We present a method to control the detection events in quantum key

distribution systems that use gated single-photon detectors. We employ bright

pulses as faked states, timed to arrive at the avalanche photodiodes outside the

activation time. The attack can remain unnoticed, since the faked states do not

increase the error rate per se. This allows for an intercept–resend attack, where

an eavesdropper transfers her detection events to the legitimate receiver without

causing any errors. As a side effect, afterpulses, originating from accumulated

charge carriers in the detectors, increase the error rate. We have experimentally

tested detectors of the system id3110 (Clavis2) from ID Quantique. We identify

the parameter regime in which the attack is feasible despite the side effect.

Furthermore, we outline how simple modifications in the implementation can

make the device immune to this attack.
Publisher
IOP Publishing
Journal
New Journal of Physics

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