Quantum secure direct communication with quantum encryption
Xihan Li, Ping Zhou, Chunyan Li, Hong-Yu Zhou, Fu‐Guo Deng · arXiv (Cornell University) · 2005
We present a scheme for quantum secure direct communication with quantum encryption following some ideas in the Zhang-Li-Guo quantum key distribution scheme [Phys. Rev. A \\textbf{64}, 024302 (2001)]. Instead of the bilateral rotation operations before each round of the transmission, the two parties of communication perform a single-particle measurement on some samples chosen randomly from the quantum key, the Einstein-Podolsky-Rosen pairs shared, with the two measuring bases $\\sigma_z$ and $\\sigma_x$. The quantum key can be used repeatedly for transmitting a secret message securely. Each of the travelling particles can carry one bit of message which can be read out directly by the receiver.