Continuous variable quantum key distribution with multi-mode signals for noisy detectors
Rupesh Kumar, Xinke Tang, A. Wonfor, Richard V. Penty, Ian H. White · Journal of the Optical Society of America B · 2019
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 shot-noise 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.