Won Young Hwang, In Gyu Koh, Yeong Deok Han
Published 1997-02-19, updated 1997-04-29Version 2
We discuss the unambiguous measurement of quantum nonorthogonal states in connection with the quantum cryptography. We show that checking a ratio of null one to signal is essential in detecting a certain kind of eavesdropping in the case of two nonorthogonal states quantum cryptography. We prove that it is not needed in the case of the four states quantum cryptography.
On the connection between the theorems of Gleason and of Kochen and Specker
On connection between purity and fidelity of quantum channels
Physics and Commonsense - Reassessing the connection in the light of quantum theory
