[15a-P4-1~2] 3.10 Optical quantum physics and technologies

[15a-P4-2] Generation of WDM time-bin entanglement in the telecommunication wavelength-band using cascaded SFG/ SPDC in a PPLN device

〇Shin Arahira¹, Hitoshi Murai¹, Hironori Sasaki¹ (1.OKI)

Keywords:quantum entanglement, quantum key distribution, WDM

We report the generation of WDM time-bin entanglement by using cascaded optical nonlinearities: sum-frequency generation and spontaneous parametric down conversion in a periodically poled LiNbO₃ waveguide device. We achieved approximately 94% of the visibilities for five wavelength-pairs in two-fold interference experiments.