Entanglement distribution over 300 km of fiber

Takahiro Inagaki, Nobuyuki Matsuda, Osamu Tadanaga, Masaki Asobe, Hiroki Takesue

Research output: Contribution to journalArticlepeer-review

147 Citations (Scopus)


We report the distribution of time-bin entangled photon pairs over 300 km of optical fiber. We realized this by using a high-speed and high signal-to-noise ratio entanglement generation/evaluation setup that consists of periodically poled lithium niobate waveguides and superconducting single photon detectors. The observed two-photon interference fringes exhibited a visibility of 84%. We confirmed the violation of Bell's inequality by 2.9 standard deviations.

Original languageEnglish
Pages (from-to)23241-23249
Number of pages9
JournalOptics Express
Issue number20
Publication statusPublished - 2013 Oct 7


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