Nonclassical interference between independent intrinsically pure single photons at telecommunication wavelength
Rui‐Bo Jin, Kentaro Wakui, Ryōsuke Shimizu, Hugo Benichi, Shigehito Miki, Taro Yamashita, Hirotaka Terai, Zhen Wang, Mikio Fujiwara, Masahide Sasaki · Physical Review A · 2013
We demonstrate a Hong-Ou-Mandel interference between two independent, intrinsically pure, heralded single photons from spontaneous parametric down-conversion (SPDC) at telecommunication wavelength. A visibility of $85.5\ifmmode\pm\else\textpm\fi{}8.3%$ was achieved without using any bandpass filter. Thanks to the group-velocity-matched SPDC and superconducting nanowire single-photon detectors (SNSPDs), the fourfold coincidence counts are one order higher than that in the previous experiments. The combination of bright single-photon sources and SNSPDs is a crucial step for future practical quantum infocommunication systems at telecommunication wavelength.