Time-bin entanglement at telecom wavelengths from a hybrid photonic integrated circuit

Hannah Thiel (Corresponding author), Lennart Jehle, Robert J. Chapman, Stefan Frick, Hauke Conradi, Moritz Kleinert, Holger Suchomel, Martin Kamp, Sven Höfling, Christian Schneider, Norbert Keil, Gregor Weihs

Publications: Contribution to journalArticlePeer Reviewed


Mass-deployable implementations for quantum communication require compact, reliable, and low-cost hardware solutions for photon generation, control and analysis. We present a fiber-pigtailed hybrid photonic circuit comprising nonlinear waveguides for photon-pair generation and a polymer interposer reaching 68dB of pump suppression and photon separation based on a polarizing beam splitter with >25dB polarization extinction ratio. The optical stability of the hybrid assembly enhances the quality of the entanglement, and the efficient background suppression and photon routing further reduce accidental coincidences. We thus achieve a 96-8+3% concurrence and a 96-5+2% fidelity to a Bell state. The generated telecom-wavelength, time-bin entangled photon pairs are ideally suited for distributing Bell pairs over fiber networks with low dispersion.
Original languageEnglish
Article number9990
Number of pages7
JournalScientific Reports
Issue number1
Publication statusPublished - 1 May 2024

Austrian Fields of Science 2012

  • 103026 Quantum optics
  • 103021 Optics

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