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      Daylight operation of a free space, entanglement-based quantum key distribution system

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          Abstract

          Many quantum key distribution (QKD) implementations using a free space transmission path are restricted to operation at night time in order to distinguish the signal photons used for a secure key establishment from background light. Here, we present a lean entanglement-based QKD system overcoming that imitation. By implementing spectral, spatial and temporal filtering techniques, we were able to establish a secure key continuously over several days under varying light and weather conditions.

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          Free-space quantum key distribution with entangled photons

          We report on a complete experimental implementation of a quantum key distribution protocol through a free space link using polarization-entangled photon pairs from a compact parametric down-conversion source. Over 10 hours of uninterrupted communication between sites 1.5 km apart, we observe average key generation rates of 630 per second after error correction and privacy amplification. Our scheme requires no specific hardware channel for synchronization apart from a classical wireless link, and no explicit random number generator.
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            Author and article information

            Journal
            10 December 2008
            Article
            10.1088/1367-2630/11/4/045007
            0812.1880
            619164f1-1316-4b1b-849d-b7be19a312b0

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

            History
            Custom metadata
            New J. Phys. 11 045007 (2009)
            13 pages, 6 figures
            quant-ph

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