Continuous variable quantum key distribution with multi-mode signals for noisy detectors. (arXiv:1907.06472v1 [quant-ph])

This paper proposes a multi-mode Gaussian modulated continuous variable
quantum key distribution (CV-QKD) scheme able to operate at high bandwidth
despite using conventional noisy, coherent detectors. We demonstrate
enhancement in shotnoise sensitivity as well as reduction in the electronic
noise variance of the coherent receiver of the multi-mode CV-QKD system. A
proof-of-concept simulation is presented using multiple modes; this
demonstrates an increase in signal-to-noise ratio and secure key rate at
various transmission distances with increasing signal modes.

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