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Low jitter up-conversion detectors for telecom wavelength GHz QKD

Krainer, L.
Zeller, S. C.
Rochas, A.
Rech, I.
Cova, S.
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Published in New Journal of Physics. 2006, vol. 8, no. 3, p. 32-32
Abstract We have developed a hybrid single photon detection scheme for telecom wavelengths based on nonlinear sum-frequency generation and silicon single-photon avalanche diodes (SPADs). The SPAD devices employed have been designed to have very narrow temporal response, i.e. low jitter ∼40 ps, which we can exploit for increasing the allowable bit rate for quantum key distribution. The wavelength conversion is obtained using periodically poled lithium niobate waveguides (W/Gs). The inherently high efficiency of these W/Gs allows us to use a continuous wave laser to seed the nonlinear conversion so as to have a continuous detection scheme. We also present a 1.27 GHz qubit repetition rate, one-way phase encoding, quantum key distribution experiment operating at telecom wavelengths that takes advantage of this detection scheme. The proof-of-principle experiment shows a system capable of MHz raw count rates with a QBER less than 2% and estimated secure key rates greater than 100 kbit s - 1 over 25 km.
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THEW, Rob et al. Low jitter up-conversion detectors for telecom wavelength GHz QKD. In: New Journal of Physics, 2006, vol. 8, n° 3, p. 32-32. https://archive-ouverte.unige.ch/unige:36779

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Deposited on : 2014-05-20

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