Full-field implementation of a perfect eavesdropper on a quantum cryptography system

Details Full-field implementation of a perfect eavesdropper on a quantum cryptography system Full-field implementation of a perfect eavesdropper on a quantum cryptography system

2010-10-30

arxiv.org/abs/1011.0105v2

Nat. Commun. 2, 349 (2011)

Physics

Quantum Physics

Revised after editorial and peer-review feedback. This version is published in Nat. Commun. 8 pages, 6 figures, 1 table

Scientific paper

10.1038/ncomms1348

Quantum key distribution (QKD) allows two remote parties to grow a shared secret key. Its security is founded on the principles of quantum mechanics, but in reality it significantly relies on the physical implementation. Technological imperfections of QKD systems have been previously explored, but no attack on an established QKD connection has been realized so far. Here we show the first full-field implementation of a complete attack on a running QKD connection. An installed eavesdropper obtains the entire 'secret' key, while none of the parameters monitored by the legitimate parties indicate a security breach. This confirms that non-idealities in physical implementations of QKD can be fully practically exploitable, and must be given increased scrutiny if quantum cryptography is to become highly secure.

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