Performance gain of displacement receiver with optimized prior probability

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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2723-2728
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number39
Publication statusPublished - 2013 Nov 22
Externally publishedYes


  • Displacement receiver
  • Feed forward8Prior probability

ASJC Scopus subject areas

  • General Physics and Astronomy


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