Advanced techniques for free-space optical quantum cryptography over water
Alexander D. Hill, Bradley Christensen, Paul G. Kwiat · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2016
Free-space quantum key distribution (QKD) over water (e.g., ship to ship) may be limited by ship motion and atmospheric effects, such as mode distortion and beam wander due to turbulence. We report on a technique which reduces noise by excluding spatial modes which are less likely to contain QKD signal photons and experimentally demonstrate an improvement in QKD key generation rates in various noise and turbulence regimes.