Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10727780 | Physics Letters A | 2013 | 6 Pages |
Abstract
We numerically study the performance of the displacement based quantum receiver for the discrimination of weak 3- and 4-phase-shift keyed (PSK) coherent state signals. We show that due to the nontrivial asymmetry of the receiver structure, optimization of the prior probability increases the mutual information and achieves sub-shot-noise limit discrimination. Moreover, we estimate the cutoff rate for a 4-PSK signal and confirm that the prior probability optimization shortens the code length for a given decoding error criterion. Such consideration for the asymmetric channel matrix is essential in a study of the compassable quantum receiver.
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Authors
M. Fujiwara, S. Izumi, M. Takeoka, M. Sasaki,