Performance gain of displacement receiver with optimized prior probability |
| |
Authors: | M. Fujiwara S. Izumi M. Takeoka M. Sasaki |
| |
Affiliation: | 1. National Institute of Information and Communications Technology, 4-2-1 Nukui-Kita, Koganei, Tokyo 184-8795, Japan;2. Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 102-8554, Japan |
| |
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. |
| |
Keywords: | Displacement receiver Feed forward Prior probability |
本文献已被 ScienceDirect 等数据库收录! |
|