Continuous Variable Quantum Key Distribution with a Noisy Laser

Entropy

Christian S. Jacobsen¹  Tobias Gehring¹ 

[1] Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark;

关键词: quantum key distribution;    continuous variables;    quantum information;   

DOI  :  10.3390/e17074654

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland