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

AuthorsMaría José, García-Martínez; Natalia, Denisenko; Diego, Soto; David, Arroyo; Amalia Beatriz, Orue; Veronica, Fernandez-Marmol
Issue Date7-May-2013
CitationApplied Optics
AbstractWe 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.
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