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<p>We present a broadband type-II SPDC source operating near 800&#xa0;nm, developed as a platform for quantum communication between sites in the city of Recife connected by kilometers of optical fibers. Local measurements of temporal correlations and Bell inequality violations confirm the generation of robust polarization-entangled photon pairs suitable for quantum key distribution (QKD). Coincidence measurements, where one photon of each pair is sent to remote nodes and returned via a fiber loop, show that quantum correlations are maintained despite propagation losses and chromatic dispersion. These results establish the capability of our system to support QKD protocols, such as BB84 and Ekert91, in metropolitan optical networks.</p>

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Photon-Pair Source for the Recife Quantum Network

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Nallyson W. S. Oliveira,
  • André C. A. Siqueira,
  • Gabriel A. Crisóstomo,
  • Paulo Martins,
  • Leandro L. L. Freitas,
  • Alexandre A. C. de Almeida,
  • Lúcio H. Acioli,
  • Joaquim F. Martins-Filho,
  • Leonardo D. Coelho,
  • José Ferraz,
  • Daniel Felinto

摘要

We present a broadband type-II SPDC source operating near 800 nm, developed as a platform for quantum communication between sites in the city of Recife connected by kilometers of optical fibers. Local measurements of temporal correlations and Bell inequality violations confirm the generation of robust polarization-entangled photon pairs suitable for quantum key distribution (QKD). Coincidence measurements, where one photon of each pair is sent to remote nodes and returned via a fiber loop, show that quantum correlations are maintained despite propagation losses and chromatic dispersion. These results establish the capability of our system to support QKD protocols, such as BB84 and Ekert91, in metropolitan optical networks.