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Correction published on 20 October 2016, see Entropy 2016, 18(10), 373.

Open AccessArticle
Entropy 2015, 17(7), 4654-4663;

Continuous Variable Quantum Key Distribution with a Noisy Laser

Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark
Author to whom correspondence should be addressed.
Received: 12 May 2015 / Revised: 30 June 2015 / Accepted: 1 July 2015 / Published: 3 July 2015
(This article belongs to the Special Issue Quantum Cryptography)
Full-Text   |   PDF [1350 KB, uploaded 25 October 2016]


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. View Full-Text
Keywords: quantum key distribution; continuous variables; quantum information quantum key distribution; continuous variables; quantum information
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Jacobsen, C.S.; Gehring, T.; Andersen, U.L. Continuous Variable Quantum Key Distribution with a Noisy Laser. Entropy 2015, 17, 4654-4663.

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