Quantum key distribution scheme with orthogonal product states
Guo‐Ping Guo, Chuan‐Feng Li, Bao‐Sen Shi, Jian Li, Guang‐Can Guo · Physical Review A · 2001
The general conditions for the orthogonal product states of the multistate systems to be used in quantum key distribution (QKD) are proposed, and a novel QKD scheme with orthogonal product states in the $3\ifmmode\times\else\texttimes\fi{}3$ Hilbert space is presented. We show that this protocol has many distinct features such as great capacity and high efficiency. The generalization to $n\ifmmode\times\else\texttimes\fi{}n$ systems is also discussed and an asymptotic limit of 1/2 for the eavesdropper's success probability is obtained.