Unidimensional continuous-variable quantum key distribution

Vladyslav C. Usenko, Frédéric Grosshans
2015 Physical Review A. Atomic, Molecular, and Optical Physics  
We propose the continuous-variable quantum key distribution protocol based on the Gaussian modulation of a single quadrature of the coherent states of light, which is aimed to provide simplified implementation compared to the symmetrically modulated Gaussian coherent-state protocols. The protocol waives the necessity in phase quadrature modulation and the corresponding channel transmittance estimation. The security of the protocol against collective attacks in a generally phase-sensitive
more » ... se-sensitive Gaussian channels is analyzed and is shown achievable upon certain conditions. Robustness of the protocol to channel imperfections is compared to that of the symmetrical coherent-state protocol. The simplified unidimensional protocol is shown possible at a reasonable quantitative cost in terms of key rate and of tolerable channel excess noise.
doi:10.1103/physreva.92.062337 fatcat:ht44k3ckszdczizmhoviq776um