High-speed free-space quantum key distribution system for urban daylight applications

M. J. García-Martínez*, N. Denisenko, D. Soto, D. Arroyo, A. B. Orue, V. Fernandez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


We report a free-space quantum key distribution system designed for high-speed key transmission in urban areas. Clocking the system at gigahertz frequencies and efficiently filtering background enables higher secure key rates than those previously achieved by similar systems. The transmitter and receiver are located in two separate buildings 300 m apart in downtown Madrid and they exchange secure keys at rates up to 1 Mbps. The system operates in full bright daylight conditions with an average secure key rate of 0.5 Mbps and 24 h stability without human intervention.

Original languageEnglish
Pages (from-to)3311-3317
Number of pages7
JournalApplied Optics
Issue number14
StatePublished - 10 May 2013
Externally publishedYes


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