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Displacement receiver for phase-shift-keyed coherent states
- Publication Year :
- 2012
-
Abstract
- The quantum receiver is an important tool for overcoming the standard quantum limit (SQL) of discrimination errors in optical communication. We theoretically study the quantum receivers for discriminating ternary and quaternary phase-shift-keying coherent states in terms of average error rate and mutual information. Our receiver consists of on-off--type photon detectors and displacement operations without electrical feedforward operations. We show that for the ternary signals, the receiver shows a reasonable gain from the SQL even without feedforward. This scheme is realizable with the currently available technology. For the quaternary signals feedforward operation is crucial to overcome the SQL with imperfect devices. We also analytically examine the asymptotic limit of the performance of the proposed receiver with respect to the number of feedforward steps.
- Subjects :
- Physics
Quantum Physics
Quantum limit
Feed forward
Optical communication
Word error rate
FOS: Physical sciences
Atomic and Molecular Physics, and Optics
Limit (music)
Electronic engineering
Coherent states
Quantum information science
Quantum Physics (quant-ph)
Quantum
Computer Science::Information Theory
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....8ce35dfd1b0c828c825fb27cb36bae55