Long-distance entanglement-based quantum key distribution over optical fiber.

  title={Long-distance entanglement-based quantum key distribution over optical fiber.},
  author={Toshimori Honjo and Sae Woo Nam and Hiroki Takesue and Qiang Zhang and Hidehiko Kamada and Yoshiki Nishida and Osamu Tadanaga and Masaki Asobe and Burm Baek and R. E. Hadfield and Shigehito Miki and Mikio Fujiwara and Masahide Sasaki and Zhiyuan Wang and Kyo Inoue and Yoshihisa Yamamoto},
  journal={Optics express},
  volume={16 23},
We report the first entanglement-based quantum key distribution (QKD) experiment over a 100-km optical fiber. We used superconducting single photon detectors based on NbN nanowires that provide high-speed single photon detection for the 1.5-mum telecom band, an efficient entangled photon pair source that consists of a fiber coupled periodically poled lithium niobate waveguide and ultra low loss filters, and planar lightwave circuit Mach-Zehnder interferometers (MZIs) with ultra stable operation… CONTINUE READING
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Large sensitive - area NbN nanowire superconducting single - photon detectors fabricated on single - crystal MgO substrates

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Generation of 1 . 5 - um band time - bin entanglement using spontaneous fiber four - wave mixing and planar lightwave circuit interferometers

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