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We propose a novel scheme for continuous variable quantum keydistribution(CV-QKD) using the subcarrier multiplexing technique which wasemployed in microwave photonics. This scheme allows to distribute N channelsindependent Gaussian modulated CV-QKD in parallel with one laser source andseveral phase modulators. We analyze the influence of nonlinear signal mixingand the security in the asymptotic limit. Results indicate that by using thismultiplexing technique, each channel will be introduced a non-Gaussian extrasource noise, resulting slightly short of the maximum transmission distance,while the total secret key rate can be considerably increased. This schemecould also be used for key distribution for multi-users and combined with theWDM devices it has the potential to construct a CV-QKD network.

Multi-channel parallel continuous variable quantum key distribution with Gaussian modulation