摘要

The authors call attention to previous work with related result, a quantum-key-distribution scheme based on partial unknown entanglement with Wigner's inequality to establish the security of the quantum channel. The sender chooses any entangled state from a certain set or its equivalent state randomly, and sends a sequence of particles out of each pair to the receiver. The two users each choose between two measurements along the fixed axes. In fact, this is a quantum cryptosystem based on mixed entanglement. The main paper was published in Phys. Rev. A 64, 032305 (2001).