On the Security of Interferometric Quantum Key Distribution

Details On the Security of Interferometric Quantum Key Distribution On the Security of Interferometric Quantum Key Distribution

2011-10-30

arxiv.org/abs/1110.6573v1

Physics

Quantum Physics

21 pages, 5 figures

Scientific paper

Photonic quantum key distribution is commonly implemented using interferometers, devices that inherently cause the addition of vacuum ancillas, thus enlarging the quantum space in use. This enlargement sometimes exposes the implemented protocol to new kinds of attacks that have not yet been analyzed. We consider several quantum key distribution implementations that use interferometers, and analyze the enlargement of the quantum space caused by the interferometers. While we prove that some interferometric implementations are robust (against simple attacks), we also show that several other implementations used in QKD experiments are totally insecure. This result is somewhat surprising since although we assume ideal devices and an underlying protocol which is proven secure (e.g., the Bennett-Brassard QKD), the realization is insecure. Our novel attack demonstrates the risks of using practical realizations without performing an extensive security analysis regarding the specific setup in use.

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