Generation of high-purity entangled photon pairs using silicon wire waveguide.
We observed high-purity correlated and entangled photon pairs generated through spontaneous four-wave mixing (SFWM) in a silicon wire waveguide (SWW). Employing a nano-scale silicon waveguide with a low loss mode size converter, we obtained a high coincidence to accidental coincidence ratio (CAR) of around 200 that was larger than that of cooled dispersion shifted fiber (DSF) by a factor 3.2, and observed the two-photon interference fringe of time-bin entangled photons with > 95% visibility without subtracting the accidental coincidences.
Harada
Ken-ichi
K
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, 243-0198, Japan. kharada@will.brl.ntt.co.jp
Takesue
Hiroki
H
Fukuda
Hiroshi
H
Tsuchizawa
Tai
T
Watanabe
Toshifumi
T
Yamada
Koji
K
Tokura
Yasuhiro
Y
Itabashi
Sei-ichi
S
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D055096:Optical Devices; D017785:Photons; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*
D012825:Silicon