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The phase-coding quantum cryptographic scheme using the homodyne detectionand weak coherent state [Hirano et al.,Phys. Rev. A 68, 042331 (2003)] providesthe simplest continuous-variable quantum key distribution scheme from theexperimental side. However, the inherent loss of the practical system will notonly increase the bit error rate (BER) but also affect the security of thefinal key. In this paper, we propose a single-photon-detection attack, and thenthe security of the final key will be compromised in some parameter regimes.Our results show that the BER induced by Eve can be lower than the inherent BERinduced by the loss of the system in some parameter regimes. Furthermore, ourattack gives the maximal communication distance of this scheme for givenexperimental parameters.

Single-photon-detection attack on the phase-coding continuous-variable quantum cryptography