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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 20 — Oct. 15, 2009
  • pp: 3169–3171

Ultranarrow bandwidth spectral filtering for long-range free-space quantum key distribution at daytime

David Höckel, Lars Koch, Eugen Martin, and Oliver Benson  »View Author Affiliations

Optics Letters, Vol. 34, Issue 20, pp. 3169-3171 (2009)

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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.

© 2009 Optical Society of America

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(330.6180) Vision, color, and visual optics : Spectral discrimination
(200.2605) Optics in computing : Free-space optical communication
(270.5568) Quantum optics : Quantum cryptography

ToC Category:
Quantum Optics

Original Manuscript: July 28, 2009
Revised Manuscript: September 10, 2009
Manuscript Accepted: September 12, 2009
Published: October 9, 2009

David Höckel, Lars Koch, Eugen Martin, and Oliver Benson, "Ultranarrow bandwidth spectral filtering for long-range free-space quantum key distribution at daytime," Opt. Lett. 34, 3169-3171 (2009)

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