中国物理B ›› 2007, Vol. 16 ›› Issue (4): 910-914.doi: 10.1088/1009-1963/16/4/007
朱甫臣1, 杨宇光2, 温巧燕3
Yang Yu-Guang(杨宇光)a)†, Wen Qiao-Yan(温巧燕)b), and Zhu Fu-Chen(朱甫臣)c)
摘要: An efficient two-step quantum key distribution (QKD) protocol with orthogonal product states in the n\otimes n(n\geq3)Hilbert space is presented. In this protocol, the particles in the orthogonal product states form two particle sequences. The sender, Alice, first sends one sequence to the receiver, Bob. After Bob receives the first particle sequence, Alice and Bob check eavesdropping by measuring a fraction of particles randomly chosen. After ensuring the security of the quantum channel, Alice sends the other particle sequence to Bob. By making an orthogonal measurement on the two particle sequences, Bob can obtain the information of the orthogonal product states sent by Alice. This protocol has many distinct features such as great capacity, high efficiency in that it uses all orthogonal product states in distributing the key except those chosen for checking eavesdroppers.
中图分类号: (Quantum cryptography and communication security)