Quantum key distribution with 1.25 Gbps clock synchronization

Details Quantum key distribution with 1.25 Gbps clock synchronization Quantum key distribution with 1.25 Gbps clock synchronization

2004-05-17

arxiv.org/abs/quant-ph/0405097v1

Optics Express 12, 2011-2016 (2004)

Physics

Quantum Physics

6 pages, 3 figures, 99 kB .pdf document

Scientific paper

10.1364/OPEX.12.002011

We have demonstrated the exchange of sifted quantum cryptographic key over a 730 meter free-space link at rates of up to 1.0 Mbps, two orders of magnitude faster than previously reported results. A classical channel at 1550 nm operates in parallel with a quantum channel at 845 nm. Clock recovery techniques on the classical channel at 1.25 Gbps enable quantum transmission at up to the clock rate. System performance is currently limited by the timing resolution of our silicon avalanche photodiode detectors. With improved detector resolution, our technique will yield another order of magnitude increase in performance, with existing technology.

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