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Coherent-state discrimination via nonheralded probabilistic amplification.
- Source :
-
Physical Review A: Atomic, Molecular & Optical Physics . Jun2016, Vol. 93 Issue 6, p1-1. 1p. - Publication Year :
- 2016
-
Abstract
- A scheme for the detection of low-intensity optical coherent signals was studied which uses a probabilistic amplifier operated in the nonheralded version as the underlying nonlinear operation to improve the detection efficiency. This approach allows us to improve the statistics by keeping track of all possible outcomes of the amplification stage (including failures). When compared with an optimized Kennedy receiver, the resulting discrimination success probability we obtain presents a gain up to ~1.85% and it approaches the Helstrom bound appreciably faster than the Dolinar receiver when employed in an adaptive strategy. We also notice that the advantages obtained can ultimately be associated with the fact that, in the high-gain limit, the nonheralded version of the probabilistic amplifier induces a partial dephasing which preserves quantum coherence among low-energy eigenvectors while removing it elsewhere. A proposal to realize such a transformation based on an optical cavity implementation is presented. [ABSTRACT FROM AUTHOR]
- Subjects :
- *COHERENCE (Physics)
*PROBABILITY theory
Subjects
Details
- Language :
- English
- ISSN :
- 10502947
- Volume :
- 93
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Physical Review A: Atomic, Molecular & Optical Physics
- Publication Type :
- Periodical
- Accession number :
- 119569381
- Full Text :
- https://doi.org/10.1103/PhysRevA.93.062315