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Continuous variable quantum key distribution with modulated entangled states

Author

Listed:
  • Lars S. Madsen

    (Technical University of Denmark)

  • Vladyslav C. Usenko

    (Palacký University
    Bogolyubov Institute for Theoretical Physics of National Academy of Sciences)

  • Mikael Lassen

    (Technical University of Denmark)

  • Radim Filip

    (Palacký University)

  • Ulrik L. Andersen

    (Technical University of Denmark)

Abstract

Quantum key distribution enables two remote parties to grow a shared key, which they can use for unconditionally secure communication over a certain distance. The maximal distance depends on the loss and the excess noise of the connecting quantum channel. Several quantum key distribution schemes based on coherent states and continuous variable measurements are resilient to high loss in the channel, but are strongly affected by small amounts of channel excess noise. Here we propose and experimentally address a continuous variable quantum key distribution protocol that uses modulated fragile entangled states of light to greatly enhance the robustness to channel noise. We experimentally demonstrate that the resulting quantum key distribution protocol can tolerate more noise than the benchmark set by the ideal continuous variable coherent state protocol. Our scheme represents a very promising avenue for extending the distance for which secure communication is possible.

Suggested Citation

  • Lars S. Madsen & Vladyslav C. Usenko & Mikael Lassen & Radim Filip & Ulrik L. Andersen, 2012. "Continuous variable quantum key distribution with modulated entangled states," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2097
    DOI: 10.1038/ncomms2097
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