论文信息 - Comment on “Controlled DSQC using five-qubit entangled states and two-step security test”

Comment on “Controlled DSQC using five-qubit entangled states and two-step security test”

Abstract A controlled deterministic secure quantum communication protocol [X.M. Xiu, L. Dong, Y.J. Cao, F. Chi, Opt. Commun. 282 (2009) 333] with five-qubit entangled states was proposed recently. The aim of Xiu et al. was that the successful realization of communication between Alice and Bob needed the cooperation of a controller, Charlie. However, we show that the controller Charlie’s role could be excluded unknowingly. Moreover, an eavesdropper can entangle an ancilla without introducing any error in the first security test and then she can distill a quarter of the secret messages from her entangled ancilla.

Su-Juan Qin | Qiao-Yan Wen | Fu-Chen Zhu | Luo-Ming Meng

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