Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Information: Quantum Communication II

Q 56.5: Talk

Friday, March 12, 2010, 11:30–11:45, A 310

Implementation of an attack scheme on a practical QKD system — Qin Liu¹, Ilja Gerhardt², Antia Lamas-Linares², Vadim Makarov¹, and •Christian Kurtsiefer² — ¹NTNU Trondheim — ²Centre for Quantum Technologies/Physics Department, Nat. Univ. Singapore

We report on an experimental implementation of an attack of a practical quantum key distribution system [1], based on a vulnerability of single photon detectors [2]. An intercept/resend-like attack has been carried out which revealed 100% of the raw key generated between the legitimate communication partners. No increase of the error ratio was observed, which is usually considered a reliable witness for any eavesdropping attempt. We also present an experiment which shows that this attack is not revealed by key distribution protocols probing for eavesdroppers by testing a Bell inequality [3], and discuss implications for practical quantum key distribution.
0mm [1] I. Marcikic, A. Lamas-Linares, C. Kurtsiefer, Appl. Phys. Lett. 89, 101122 (2006)
[2] V. Makarov, New J. Phys. 11, 065003 (2009)
[3] A. Ling et al., Phys. Rev. A 78, 020301(R), (2008)