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Performance gain of displacement receiver with optimized prior probability
- Source :
- Physics Letters A. 377:2723-2728
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
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.
- Subjects :
- Physics
Quantum Physics
FOS: Physical sciences
General Physics and Astronomy
Mutual information
Displacement (vector)
Matrix (mathematics)
Prior probability
Coherent states
Limit (mathematics)
Quantum Physics (quant-ph)
Algorithm
Decoding methods
Computer Science::Information Theory
Communication channel
Subjects
Details
- ISSN :
- 03759601
- Volume :
- 377
- Database :
- OpenAIRE
- Journal :
- Physics Letters A
- Accession number :
- edsair.doi.dedup.....01544c3fecc65c6e493560ee26101fe5