Long Distance Entangled State Quantum Key Distribution

  • Grégoire Ribordy
  • Nicolas Gisin
  • Hugo Zbinden


A quantum key distribution system based on photon pairs entangled in energytime and optimized for long distance transmission is presented. It is based on a Franson arrangement for monitoring quantum correlations, and uses a protocol analogous to BB84. Passive state preparation is implemented by polarization multiplexing in the interferometers. We distributed a sifted key of 0.4 Mbits at a raw rate of 134 Hz and with an error rate of 8.6% over a distance of 8.5 kilometers.


Quantum Communication Path Difference Photon Pair Interference Visibility Entangle Photon Pair 
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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Grégoire Ribordy
    • 1
  • Nicolas Gisin
    • 1
  • Hugo Zbinden
    • 1
  1. 1.Gap-OptiqueUniversité de GenèveGenève 4Switzerland

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