Direct generation of frequency-bin entangled photons via two-period quasi-phase-matched parametric downconversion

Fumihiro Kaneda, Hirofumi Suzuki, Ryosuke Shimizu, Keiichi Edamatsu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We report a simple scheme for direct generation of frequency-bin entangled photon pairs via spontaneous parametric downconversion. Our fabricated nonlinear optical crystal with two different poling periods can simultaneously satisfy two different, spectrally symmetric nondegenerate quasi-phase-matching conditions, enabling the direct generation of entanglement in two discrete frequency-bin modes. Our produced photon pairs exhibited Hong-Ou-Mandel interference with high-visibility beating oscillations— a signature of two-mode frequency-bin entanglement. Moreover, we demonstrate deterministic entanglement-mode conversion from frequency-bin to polarization modes, with which our source can be more versatile for various quantum applications. Our scheme can be extended to direct generation of high-dimensional frequency-bin entanglement, and thus will be a key technology for frequency-multiplexed optical quantum information processing.

Original languageEnglish
Pages (from-to)1416-1424
Number of pages9
JournalOptics Express
Volume27
Issue number2
DOIs
Publication statusPublished - 2019 Jan 21

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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