Quantum displacement receiver for M-ary phase-shift-keyed coherent states

Authors :: Shuro Izumi
Mikio Fujiwara
Antonio Assalini
Masahiro Takeoka
Masahide Sasaki
Nicola Dalla Pozza
Kazuhiro Ema
Source :: AIP Conference Proceedings.
Publication Year :: 2014
Publisher :: AIP Publishing LLC, 2014.
Abstract: We propose quantum receivers for 3- and 4-ary phase-shift-keyed (PSK) coherent state signals to overcome the standard quantum limit (SQL). Our receiver, consisting of a displacement operation and on-off detectors with or without feedforward, provides an error probability performance beyond the SQL. We show feedforward operations can tolerate the requirement for the detector specifications.