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Performance gain of displacement receiver with optimized prior probability

By M. Fujiwara, S. Izumi, M. Takeoka and M. Sasaki


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

Topics: Quantum Physics
Year: 2013
DOI identifier: 10.1016/j.physleta.2013.08.018
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