Abstract
Free-space global quantum communication networks of the future are expected to be robust under background radiation, including sunlight and moonlight, so as to be available at any time of day, but this is difficult to achieve. This study proposes exploiting the inherent resistance of the coherent detection used in continuous-variable quantum key distribution (CVQKD) against background light. The components of background noise in CVQKD are found to be extremely small, and to have a very subtle influence on system performance. These results suggest that CVQKD is a viable option for real-world quantum communication networks.
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