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Despite quantum networking concepts, designs, and hardware becomingincreasingly mature, there is no consensus on the optimal wavelength forfree-space systems. We present an in-depth analysis of a daytime free-spacequantum channel as a function of wavelength and atmospheric spatial coherence(Fried coherence length). We choose decoy-state quantum key distribution bityield as a performance metric in order to reveal the ideal wavelength choicefor an actual qubit-based protocol under realistic atmospheric conditions. Ouranalysis represents a rigorous framework to analyze requirements for spatial,spectral, and temporal filtering. These results will help guide the developmentof free-space quantum communication and networking systems. In particular, ourresults suggest that shorter wavelengths in the optical band should beconsidered for free-space quantum communication systems. Our results are alsointerpreted in the context of atmospheric compensation by higher-order adaptiveoptics.

Quantum Communication Over Atmospheric Channels: A Framework for Optimizing Wavelength and Filtering