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Time-bin entangled photon pairs from Bragg-reflection waveguides

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Huan Chen, Silke Auchter, Maximilian Prilmüller, Alexander Schlager, Thomas Kauten, Kaisa Laiho, Benedikt Pressl, Holger Suchomel, Martin Kamp, Sven Höfling, Christian Schneider, Gregor Weihs

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Semiconductor Bragg-reflection waveguides are well-established sources of correlated photon pairs as well as promising candidates for building up integrated quantum optics devices. Here, we use such a source with optimized non-linearity for preparing time-bin entangled photons in the telecommunication wavelength range. By taking advantage of pulsed state preparation and efficient free-running single-photon detection, we drive our source at low pump powers, which results in a strong photon-pair correlation. The tomographic reconstruction of the state’s density matrix reveals that our source exhibits a high degree of entanglement. We extract a concurrence of 88.9(1.8)% and a fidelity of 94.2(9)% with respect to a Bell state.


Original languageEnglish
Article number080804
Number of pages9
JournalAPL Photonics
Issue number8
Early online date1 Aug 2018
Publication statusPublished - Aug 2018

    Research areas

  • Time-bin entanglement, Quantum state tomography, Parametric down-conversion, Bragg-reflection waveguide

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