Sub-shot-noise-limit discrimination of on-off keyed coherent signals via a quantum receiver with a superconducting transition edge sensor.
We demonstrate a sub-shot-noise-limit discrimination of on-off keyed coherent signals by an optimal displacement quantum receiver in which a superconducting transition edge sensor is installed. Use of a transition edge sensor and a fiber beam splitter realizes high total detection efficiency and high interference visibility of the receiver and the observed average error surpasses the shot-noise-limit in a wider range of the signal power. Our technique opens up a new technology for the sub-shot-noise-limit detection of coherent signals in optical communication channels.
Tsujino
Kenji
K
National Institute of Information and Communications Technology (NICT) 4-2-1 Nukui-kitamachi, Koganei, Tokyo, 184-8795, Japan. tsujino@qci.jst.go.jp
Fukuda
Daiji
D
Fujii
Go
G
Inoue
Shuichiro
S
Fujiwara
Mikio
M
Takeoka
Masahiro
M
Sasaki
Masahide
M