26 January 2009 Quantum key distribution at GHz transmission rates
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Abstract
Quantum key distribution (QKD) channels are typically realized by transmitting and detecting single photons, and therefore suffer from dramatic reductions in throughput due to both channel loss and noise. These shortcomings can be mitigated by applying telecommunications clock-recovery techniques to maximize the bandwidth of the single-photon channel and minimize the system's exposure to noise. We demonstrate a QKD system operating continuously at a quantum-channel transmission rate of 1.25 GHz, with dedicated data-handling hardware and error-correction/privacy amplification. We discuss the design and performance of our system and highlight issues which limit our maximum transmission and key production rates.
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Alessandro Restelli, Alessandro Restelli, Joshua C. Bienfang, Joshua C. Bienfang, Alan Mink, Alan Mink, Charles W. Clark, Charles W. Clark, } "Quantum key distribution at GHz transmission rates", Proc. SPIE 7236, Quantum Communications Realized II, 72360L (26 January 2009); doi: 10.1117/12.809461; https://doi.org/10.1117/12.809461
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