Unidimensional continuous-variable quantum key distribution

Vladyslav C. Usenko and Frédéric Grosshans
Phys. Rev. A 92, 062337 – Published 28 December 2015

Abstract

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 one of the quadrature modulations and the corresponding channel transmittance estimation. The security of the protocol against collective attacks in a generally phase-sensitive Gaussian channel 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.

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  • Received 2 June 2015

DOI:https://doi.org/10.1103/PhysRevA.92.062337

©2015 American Physical Society

Authors & Affiliations

Vladyslav C. Usenko1,2,* and Frédéric Grosshans3,4,†

  • 1Department of Optics, Palacký University, 17. listopadu 50, 772 07 Olomouc, Czech Republic
  • 2Bogolyubov Institute for Theoretical Physics of National Academy of Sciences, Metrolohichna St. 14-b, 03680, Kiev, Ukraine
  • 3Laboratoire de Photonique Quantique et Moléculaire, CNRS, ENS Cachan, Université Paris Saclay, F-94235 Cachan, France
  • 4Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Universite Paris Saclay, F-91405 Orsay, France

  • *usenko@optics.upol.cz
  • frederic.grosshans@u-psud.fr

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Issue

Vol. 92, Iss. 6 — December 2015

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