Title :
Square-root measurement for quantum symmetric mixed state signals
Author :
Kato, Kentaro ; Hirota, Osamu
Author_Institution :
Fac. of Sci. & Eng., Chuo Univ., Tokyo, Japan
Abstract :
A certain class of mixed states artificially constructed that is used in quantum cryptography is crucial for representation of signals. This correspondence shows that the square-root measurement gives the optimal measurement for such a class of mixed states.
Keywords :
Bayes methods; error statistics; quantum cryptography; quantum theory; signal representation; error probability; quantum cryptography; quantum detection theory; quantum symmetric mixed state signals; square-root measurement; Amplitude shift keying; Associate members; Channel coding; Cryptography; Error probability; Information theory; Mutual information; Phase shift keying; Quadrature phase shift keying; Quantum mechanics;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2003.820050
