Entangled photon generation in two-period quasi-phase-matched parametric down-conversion

Wakana Ueno, Fumihiro Kaneda, Hirofumi Suzuki, Shigehiro Nagano, Atsushi Syouji, Ryosuke Shimizu, Koji Suizu, Keiichi Edamatsu

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


We proposed and demonstrated a simple but deterministic scheme for generating polarization-entangled photon pairs at telecommunication wavelengths with type-II quasi-phase-matched spontaneous parametric down-conversion (QPM-SPDC) having two poling periods. We fabricated a LiNbO3 crystal having two poling periods so as to generate entangled photons at two wavelengths, i.e., 1506 nm and 1594 nm. We characterized the two-photon polarization state with state tomography and confirmed that the state was highly entangled.

Original languageEnglish
Pages (from-to)5508-5517
Number of pages10
JournalOptics Express
Issue number5
Publication statusPublished - 2012 Feb 27

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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