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Square-root measurement for quantum symmetric mixed state signals

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2 Author(s)
Kato, K. ; Fac. of Sci. & Eng., Chuo Univ., Tokyo, Japan ; Hirota, O.

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.

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Information Theory, IEEE Transactions on  (Volume:49 ,  Issue: 12 )