Quantum receivers with squeezing and photon-number-resolving detectors for M-ary coherent state discrimination

Shuro Izumi, Masahiro Takeoka, Kazuhiro Ema, Masahide Sasaki

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

We propose quantum receivers with optical squeezing and photon-number-resolving detectors (PNRDs) for the near-optimal discrimination of quaternary phase-shift-keyed coherent state signals. The basic scheme is similar to the previous proposals [e.g., Izumi, Phys. Rev. APLRAAN1050-294710. 1103/PhysRevA.86.042328 86, 042328 (2012)] in which displacement operations, on-off detectors, and electrical feedforward operations were used. Here we study two types of receivers, one of which installs optical squeezings and the other uses PNRDs instead of on-off detectors. We show that both receivers can attain lower error rates than that in the previous scheme. In particular, we show the PNRD-based receiver has a significant gain when the ratio between the mean photon number of the signal and the number of the feedforward steps is relatively high, in other words, when the probability of detecting two or more photons at each detector is not negligible. Moreover, we show that the PNRD-based receiver can suppress the errors due to dark counts, which the receiver with the on-off detector cannot do with a small number of feedforwards.

Original languageEnglish
Article number042328
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume87
Issue number4
DOIs
Publication statusPublished - 2013 Apr 23
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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