Experimental demonstration of phase-remapping attack in a practical quantum key distribution system

Details Experimental demonstration of phase-remapping attack in a practical quantum key distribution system Experimental demonstration of phase-remapping attack in a practical quantum key distribution system

2010-05-13

arxiv.org/abs/1005.2376v1

New J. Phys. 12 (2010) 113026

Physics

Quantum Physics

16 pages, 6 figures

Scientific paper

Unconditional security proofs of various quantum key distribution (QKD) protocols are built on idealized assumptions. One key assumption is: the sender (Alice) can prepare the required quantum states without errors. However, such an assumption may be violated in a practical QKD system. In this paper, we experimentally demonstrate a technically feasible "intercept-and-resend" attack that exploits such a security loophole in a commercial "plug & play" QKD system. The resulting quantum bit error rate is 19.7%, which is below the proven secure bound of 20.0% for the BB84 protocol. The attack we utilize is the phase-remapping attack (C.-H. F. Fung, et al., Phys. Rev. A, 75, 32314, 2007) proposed by our group.

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