Abstract
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.
© 2011 IEEE
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