## 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.

Original language | English |
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Pages (from-to) | 2723-2728 |

Number of pages | 6 |

Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |

Volume | 377 |

Issue number | 39 |

DOIs | |

Publication status | Published - 2013 Nov 22 |

Externally published | Yes |

## Keywords

- Displacement receiver
- Feed forward8Prior probability

## ASJC Scopus subject areas

- Physics and Astronomy(all)