Practical free-space quantum key distribution over 10 km in daylight and at night

Details Practical free-space quantum key distribution over 10 km in daylight and at night Practical free-space quantum key distribution over 10 km in daylight and at night

2002-06-14

arxiv.org/abs/quant-ph/0206092v1

Physics

Quantum Physics

15 pages, 7 figures, 1 table; to be published in New Journal of Physics: http://www.njp.org

Scientific paper

10.1088/1367-2630/4/1/343

We have demonstrated quantum key distribution (QKD) over a 10-km, 1-airmass atmospheric range during daylight and at night. Secret random bit sequences of the quality required for the cryptographic keys used to initialize secure communications devices were transferred at practical rates with realistic security. By identifying the physical parameters that determine the system's secrecy efficiency, we infer that free-space QKD will be practical over much longer ranges under these and other atmospheric and instrumental conditions.

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