---
res:
  bibo_abstract:
  - "<jats:p>\r\n                    The Quantum Internet, a network of quantum-enabled
    infrastructure, represents the next frontier in telecommunications, promising
    capabilities that cannot be attained by classical counterparts. A crucial step
    in realizing such large-scale quantum networks is the integration of entanglement
    distribution within existing telecommunication infrastructure. Here, we demonstrate
    a real-world scalable quantum networking testbed deployed within Deutsche Telekom’s
    metropolitan fibers in Berlin. Using commercially available quantum devices and
    standard add-drop multiplexing hardware, we distributed polarization-entangled
    photon pairs over dynamically selectable looped fiber paths ranging from 10 m
    to 60 km and showed entanglement distribution over up to approximately 100 km.
    Quantum signals, transmitted at 1324 nm (O-band), coexist with conventional bidirectional
    C-band traffic without dedicated fibers or infrastructure changes. Active stabilization
    of the polarization enables robust long-term performance, achieving entanglement
    Bell-state fidelity bounds between 85% and 99% and Clauser–Horne–Shimony–Holt
    parameter\r\n                    <jats:italic>S</jats:italic>\r\n                    -values
    between 2.36 and 2.74 during continuous multiday operation. By achieving a high-fidelity
    entanglement distribution with less than 1.5% downtime, we confirm the feasibility
    of hybrid quantum-classical networks under real-world conditions at the metropolitan
    scale. These results establish deployment benchmarks and provide a practical roadmap
    for telecom operators to integrate quantum capabilities.\r\n                  </jats:p>@eng"
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Matheus
      foaf_name: Sena, Matheus
      foaf_surname: Sena
  - foaf_Person:
      foaf_givenName: Mael
      foaf_name: Flament, Mael
      foaf_surname: Flament
  - foaf_Person:
      foaf_givenName: Shane
      foaf_name: Andrewski, Shane
      foaf_surname: Andrewski
  - foaf_Person:
      foaf_givenName: Ioannis
      foaf_name: Caltzidis, Ioannis
      foaf_surname: Caltzidis
  - foaf_Person:
      foaf_givenName: Niccolò
      foaf_name: Bigagli, Niccolò
      foaf_surname: Bigagli
  - foaf_Person:
      foaf_givenName: Thomas
      foaf_name: Rieser, Thomas
      foaf_surname: Rieser
  - foaf_Person:
      foaf_givenName: Gabriel
      foaf_name: Bello Portmann, Gabriel
      foaf_surname: Bello Portmann
  - foaf_Person:
      foaf_givenName: Rourke
      foaf_name: Sekelsky, Rourke
      foaf_surname: Sekelsky
  - foaf_Person:
      foaf_givenName: Ralf-Peter
      foaf_name: Braun, Ralf-Peter
      foaf_surname: Braun
  - foaf_Person:
      foaf_givenName: Alexander N.
      foaf_name: Craddock, Alexander N.
      foaf_surname: Craddock
  - foaf_Person:
      foaf_givenName: Maximilian
      foaf_name: Schulz, Maximilian
      foaf_surname: Schulz
  - foaf_Person:
      foaf_givenName: Klaus
      foaf_name: Jöns, Klaus
      foaf_surname: Jöns
      foaf_workInfoHomepage: http://www.librecat.org/personId=85353
  - foaf_Person:
      foaf_givenName: Michaela
      foaf_name: Ritter, Michaela
      foaf_surname: Ritter
  - foaf_Person:
      foaf_givenName: Marc
      foaf_name: Geitz, Marc
      foaf_surname: Geitz
  - foaf_Person:
      foaf_givenName: Oliver
      foaf_name: Holschke, Oliver
      foaf_surname: Holschke
  - foaf_Person:
      foaf_givenName: Mehdi
      foaf_name: Namazi, Mehdi
      foaf_surname: Namazi
  bibo_doi: 10.1364/jocn.575396
  bibo_issue: '12'
  bibo_volume: 17
  dct_date: 2025^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1943-0620
  - http://id.crossref.org/issn/1943-0639
  dct_language: eng
  dct_publisher: Optica Publishing Group@
  dct_title: High-fidelity quantum entanglement distribution in metropolitan fiber
    networks with co-propagating classical traffic@
...