Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. iii Figures 1-4. Maps showing: 1. Study area, regions within the study area, and all well...

Free-space channels provide the possibility of establishing continuous-variable quantum key distribution in global communication networks. However, fluctuating nature transmissivity these introduces an extra noise which reduces achievable secret rate. We consider two classical postprocessing strategies, postselection high-transmissivity data and clusterization, to reduce fluctuation-induced cha...