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Impact of Third-Order Intermodulation on the Performance of Subcarrier Multiplexed Quantum Key Distribution

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2 Author(s)
Capmany, J. ; Opt. & Quantum Commun. Group, Univ. Politec. de Valencia, Valencia, Spain ; Fernandez-Pousa, C.R.

This paper extends the analysis presented in a previous contribution to account for the effect of third-order intermodulation distortion in the system quantum bit error rate attainable in subcarrier multiplexed quantum key distribution (SCM-QKD) systems, showing that under practical conditions this effect can be safely neglected. When the unconditionally secure key distribution rate is computed for BB84 SCM-QKD systems based on weak coherent pulses and strong reference, it is found a per-channel additional decrease due to nonlinear distortions as low as 1% when compared to the dedicated nonmultiplexed BB84 key distribution channels operated under the same conditions.

Published in:

Lightwave Technology, Journal of  (Volume:29 ,  Issue: 20 )

Date of Publication:

Oct.15, 2011

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