Continuous Variable Quantum Key Distribution with a Noisy Laser

Christian Scheffmann Jacobsen, Tobias Gehring, Ulrik Lund Andersen

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Existing experimental implementations of continuous-variable quantum key distribution require shot-noise limited operation, achieved with shot-noise limited lasers. However, loosening this requirement on the laser source would allow for cheaper, potentially integrated systems. Here, we implement a theoretically proposed prepare-and-measure continuous-variable protocol and experimentally demonstrate the robustness of it against
preparation noise stemming for instance from technical laser noise. Provided that direct reconciliation techniques are used in the post-processing we show that for small distances large amounts of preparation noise can be tolerated in contrast to reverse reconciliation where the key rate quickly drops to zero. Our experiment thereby demonstrates that quantum key distribution with non-shot-noise limited laser diodes might be feasible.
Original languageEnglish
Pages (from-to)4654-4663
Publication statusPublished - 2015

Bibliographical note

Correction published on 20 October 2016, see Entropy 2016, 18(10), 373. doi:10.3390/e18100373


  • Quantum key distribution
  • Continuous variables
  • Quantum information


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