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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | Ultra-Narrow Bandwidth Spectral Filtering for Long Range Free-Space Quantum Key Distribution at Daytime

David Höckel, Lars Koch, Eugen Martin, and Oliver Benson (2009)

Ultra-Narrow Bandwidth Spectral Filtering for Long Range Free-Space Quantum Key Distribution at Daytime

Optics Letters, 34:3169.

We describe a Fabry-Perot-based spectral filter for free-space quantum key distribution (QKD). A multipass etalon filter was built, and its performance was studied. The whole filter setup was carefully optimized to add less than 2 dB attenuation to a signal beam but block stray light by 21 dB. Simulations show that such a filter might be sufficient to allow QKD satellite downlinks during daytime with the current technology.