Unambiguous Measurements Based Quantum Cryptography

摘要

A new quantum cryptography (quantum key distribution) scheme based on unambiguous measurements is presented,which is secure against any individual attack allowed by quantum physics.By carefully constructing the unambiguous measurements elements a higher efficiency than previous protocols is achieved.Furthermore,an equality for the probability of the participant's reliable measurement outcome and the polarization angle that he chooses when distinguishing between two non-orthogonal states is also derived in this paper.