Qubit Zoo

Distribution of time-bin entangled qubits over 50 km of optical fiber

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Demonstrates distribution of time-bin entangled photon pairs over 50 km of optical fiber with high-visibility two-photon interference, establishing time-bin encoding as the practical choice for long-distance quantum communication in deployed fiber networks.

Key Results

  • Two-photon interference visibility: >93% after 50 km of fiber
  • Uses Franson interferometer configuration
  • Time-bin encoding maintains coherence through chromatic dispersion and birefringence
  • Key milestone for fiber-based quantum key distribution

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